Figs. 1-6. 
1G 
4 
iL 
PLATE ov te. 
THINNFELDIA VARIABILIS, Sp. DOV ..--.--------- 
Mwo;compoundspinn sos-- = sone tesa ee eee ee 
Portion/of a lower pinnaimagnifieds=...c.casc-s- -- Sacses ecient ee eeee nce cceeeeee 
Portion of an upper pinna magnified ....--..---. 
jliplotaspinna magnined..-- poesia aes oe 
: Upper. part of aicompound|pinna---.-..--ce.-seeinasc'coe cies e eee ees eaeaisseeisceeeere 
sebiNn BOL 2 MRONNCO 2 scr= alanye ee loesamisc cso eee eee eee See mee ee ee meee ene ae eee 
. Portions of two ultimate pinne®.....-..-.......- 
binna.of os mapnified cess tease nes salee eee o eee 
. Portion of the upper part of a primary compound pinna or of the frond.......---- 
. Portion of the same magnified to show nervation 
. Upper part of an ultimate pinna .-----.-.-.....- 
Tip of a pinna from road-side near Potomac Run 
