Per the cross family precedent (http://heraldry.sca.org/loar/2009/05/09-05cl.html):

From Wreath: Crosses and Substantial Difference

Given the widespread support for the proposal, we are implementing Batonvert's proposal on crosses that appeared on the Cover Letter for the August 2008 LoAR. Substantial difference under X.2 will henceforth be granted between crosses appearing below that do not belong to the same family. The families are:

Plain crosses couped, including Latinate and humetty.

Crosses flory, floretty, patonce, clechy, Calatrava, and Santiago.

Crosses crosslet and bottony.

Crosses moline, sarcelly, recercelly, anchory, fourchy, and miller.

Crosses formy/paty. (see the note, below)

Crosses doubled, patriarchal, and Lorraine.

The cross potent/billety.

The Tau cross.

The cross of Calvary.

The cross of Toulouse.

The cross gringoly.

The cross pomelly/bourdonny.

The Maltese cross.

We note that, in period, the term paty could refer to crosses in the flory family. The formy/paty family is not intended to overlap these two groups, we are using the SCA blazon term.

Standard period variants of a particular style of cross will not be considered separate; no difference is granted for fitching, changing between equal-armed and Latinate, etc.

Substantial difference between crosses is not limited to the above list. It is, instead, intended to provide a set of guidelines on the most frequently seen crosses in heraldry. All rulings of substantial difference which are not addressed by the above list remain in force, as do all rulings on significant difference.

---

A new feature set has been defined: cross_family

The values are:

 calvary|cross_family
 crosslet|cross_family
 doubled|cross_family
 flory|cross_family
 formy|cross_family
 gringoly|cross_family
 maltese|cross_family
 moline|cross_family
 other cross|cross_family
 plain cross|cross_family
 pomelly|cross_family
 potent|cross_family
 tau|cross_family
 toulouse|cross_family

I've gone through and extracted every distinct phrase in blazons that map to each (and sometimes more than one) feature.

calvary

cross of Calvary potent

cross of Calvary

cross calvary

patriarchal cross calvary orthodox botonny

crosslet

Celtic cross bottonny, mounted on three grieces

cross botanny

cross botonny

cross bottonny

cross bottonny fitchy

cross bottony

cross bottony fitchy

cross bottony pierced

cross bottony quarter-pierced

cross crosslet

cross crosslet Calvary

cross crosslet fitchy

cross crosslet fitchy quadrate

cross crosslet fitchy square pierced

cross crosslet fitchy square-pierced

cross crosslet formy fitchy

cross crosslet voided

cross Latin bottony

cross of Saint Julian

cross of St. Julian

cross patriarchal bottony

cross-crosslet fitchy

cross-crosslet quarter-pierced

crosslet

crusilly

crusilly fitchy

crusily

crusily (sometimes fitchy)

crusily bottony

crusily crosslet fitchy

crusily fitchy

Latin cross bottonny

latin cross bottony

Latin cross bottony

Latin cross crosslet

Latin cross-crosslet

Latin crosses botonny

Latin doubled cross crosslet

patriarchal cross bottony

patriarchal cross calvary orthodox botonny

patriarchal crosses crosslet

Russian Orthodox cross botonny graded

three passion cross botonny

doubled

cross couped of three crossbars missing the dexter base arm

cross couped of three crossbars, missing the dexter base arm

cross Lorraine

cross Lorraine fitchy at all points

cross of Lorraine

cross patriarchal

cross patriarchal bottony

double cross

doubled cross

Eastern Orthodox cross

Greek Orthodox cross

Latin doubled crosses crosslet

Lorraine cross

patriarchal cross

Patriarchal cross

patriarchal cross botonny

patriarchal cross bottony

patriarchal cross crosslet

patriarchal cross fitchy

patriarchal cross fleury

patriarchal cross flory

rogacina doubly crossed and fourchy

Russian cross

Russian Orthodox cross

Russian Orthodox cross botonny graded

patriarchal cross calvary orthodox botonny

flory

cross clech{e'}

cross clechy

cross clechy fitchy

cross clechy pommetty

cross clechy voided

cross crosslet fleury concave

cross crosslet flory

cross fleuretty

cross fleury

cross fleury azure irradiated

cross fleury fitchy

cross fleury fitchy

cross fleury quadrate

cross floretty

cross flory

cross flory fitchy

cross flory tripartite

cross formy floretty

cross of Calatrava

cross of four fleurs-de-lys conjoined at their bases

cross of Santiago

cross patonce

cross patoncy

cross pattonce

cross sable a cross potent (later floretty)

cross triparted and fretted fleury

cross triparted and fretted fleury

crosses formy patonce

crusilly clechy

crusilly fleury

crusilly flory

crusilly Latin Celtic flory

crusilly Latin fleury

crusilly patonce

crusilly patoncy

crusily flory

crusily Latin flory

equal-armed Celtic cross clechy

equal-armed Celtic cross flory

four demi-fleurs conjoined in cross

Latin cross clechy

Latin cross fleury

Latin cross fleury fitchy

Latin cross floretty

Latin cross flory

Latin cross formy floretty

Latin cross patonce

Maltese cross patonce

Maltese cross patoncy

patriarchal cross fleury

patriarchal cross flory

patriarchal cross flory azure

formy

Celtic cross formy

Celtic cross patty

cross crosslet formy fitchy

cross formy

cross formy convex

cross formy fitched

cross formy fitched at the foot

cross formy fitchy

cross formy fitchy at all points

cross formy floretty

cross formy nowy

cross formy nowy quadrate

cross formy patonce

cross formy quadrate

cross formy quarter-pierced

cross formy swallowtail

cross formy swallowtailed

cross formy voided

cross pat{e'}e quadrate

cross patee quadrate

cross patt{e'}

cross patt{e'}e

cross pattee

cross patty

cross patty elongated in pale

cross patty fitchy

cross patty sarcelled

cross paty

cross paty fitchy

cross paty fitchy

crusilly formy

crusilly Latin formy

crusily formy fitchy

crusily patty

equal armed Celtic cross formy

equal-armed Celtic cross formy

Latin cross formy

Latin cross formy fitched at the foot

Latin cross formy floretty

Latin cross formy nowy

Latin cross formy swallowtailed

Latin cross patty

passion cross, ends formee

gringoly

cross gringol{e'}

maltese

crusily Maltese

long Maltese cross

long Maltese cross nowy pierced

maltese cross

Maltese cross

Maltese cross elongated to base

Maltese cross fitchy

Maltese cross nowy

Maltese crosses patoncy

Maltese Latin cross

moline

cross moline disjointed

cross moline

crusilly moline

cross moline nowy

cross moline fitchy

Latin cross fourchy

cross moline notched of all four

cross fourchetty

cross miller

cross of four anchors conjoined at the ring

long cross moline

cross forch{e'}es

cross moline disjoined

cross moline quarter-pierced

cross moline disjoint

Latin cross moline

cross fourchy

cross moline nowy quadrate

cross Moline

cross moline voided

Two millrinds in cross

cross mill-rind

other_cross

ankh

Bowen cross

Bowen knot crosswise

bowen knot in cross

Canterbury cross

celtic cross

Celtic cross

Celtic cross fitchy

Coptic cross

cross alis{e'}e -- (note: a cross alisee is a cross formy/patty cut out of a roundel instead of a delf. maybe it belongs in the formy family? - Istvan)

cross alis{e'}e fitchy

cross annulety arms formy and voided - really; looked at the picture

cross argent griffee-de-loup, pierced

cross avellane

cross avellane dismembered

cross barby

cross barby fitchy

cross bretessed couped

cross couped of chain

cross couped rayonnant

cross couped voided ending in four two-towered castles

cross crescenty

cross ending in four pheons

cross erminy

cross fleury azure irradiated

cross formed of six white-based opals proper

cross glandular saltirewise

cross gurgitee

cross gurgity

cross nowy quadrate couped

cross of Canterbury

cross of Cerda{n~}a

cross of Cerdana

cross of chains couped

cross of Cleves

cross of ermine spots

cross of ermine tails

cross of fire rayonny

cross of five lozenges

cross of five mascles

cross of four arrowheads

cross of four ermine spots

cross of four ermine spots conjoined

cross of four ermine tails

cross of four fusils

cross of four lozenges

cross of four lozenges nowed at the center

cross of four mascles

cross of four mascles pometty

cross of four passion nails

cross of four pheons

cross of four pheons conjoined at the points

cross of four pheons points to center

cross of four seaxes conjoined at the pommel

cross of four swords conjoined at the points

cross of lozenges

cross of Saint Bridget

cross of Saint Brigid

cross of Samildanach

cross of St. Brigid

cross of swords tips to center

cross patty sarcelled - looked at the picture I did...

cross pointed

cross pointed raguly

cross pointed, voided and interlaced

cross quadrate couped

cross swallowtail

cross swallowtailed

cross swallowtailed fitchy

cross swallowtailed quadrate

cross urdy

cross urdy fitchy argent

crusilly of ermine spots counterchanged

crusilly pointed

crusilly swallowtailed

crusily Celtic

crusily Cerda{n~}a

crux ansata

crux ansata fitchy

crux ansata patty

crux stellata

equal-armed Celtic cross

equal-armed Celtic cross couped plain

five lozenges conjoined in cross

five mascles conjoined in cross

five mascles, conjoined in cross

Four compass stars conjoined in cross

four ermine spots in cross

four ermine spots in cross bases to center

four lozenges conjoined in cross

four mascles conjoined in cross, pommetty at all joints

four seebl{a:}tter in cross, points conjoined

Latin cross of bones

Latin cross of six annulets interlaced

Latin cross pointed

Latin cross raguly

Latin cross swallowtailed

Latinate Celtic cross

long Celtic cross

long cross barby nowy

Non cross

rogacina crossed and fourchy

Saint Brigid's cross

San Damiano crucifix

St. Brigid's crosses

star cross

straight-armed St. Brigid's cross

swallowtailed cross

Three nails bound into the shape of a cross, one palewise, the others fesswise, points to center

Two cartouches voided and interlaced in cross

two links of chain fretted in cross

Ukrainian sun-cross

plain_cross

an orb

cross

cross couped

cross couped and fitchy

cross couped and pierced

cross couped and quarter-pierced

cross couped disjointed

cross couped fitchy

cross couped parted and fretted

cross couped quarter-pierced

cross couped quarter-pierced

cross couped triply parted

cross fitchy

cross humetty

cross issuant to chief

cross nowy couped

cross quadrate parted and fretted

cross triple-parted and fretted

cross voided

crusilly couped

crusilly Latin

crusilly plain

crusily Latin

Greek cross

Latin cross

Latin cross fitchy

Latin cross inverted

Latin cross nowy pierced

Latin cross voided

long cross

Passion cross

the George Cross

the Union flag

pomelly

equal-armed celtic cross pommety

cross pomelly fitchy

cross pomelly

crosses pommy

crusilly pommety

cross bourdonny

crusilly Latin pomelly

cross pommetty

Latin cross pometty

cross doubly pommeled

Latin cross pomelly at the foot

cross pommy fitchy

cross clechy pommetty

potent

cross potent

cross of Jerusalem

Jerusalem Cross

long cross potent

equal-armed Celtic cross potent

crusilly potent

Cross of Jerusalem

cross gammadion saltirewise

cross potenty - yes, I looked at the picture

crosslet potent

Latin cross potent nowy quadrate

cross potent (later floretty)

Latin cross potent

latin crosses potent

equal-armed Celtic cross potent

cross potent fitchy

cross potent rebated

tau

tau cross

Tau cross

cross of St. Antony

cross tau

Tau cross swallowtailed

toulouse

Latin cross of Toulouse

key cross

cross of Toulouse

key cross nowy pierced