BROADHURST: STRUTHIOPTERIS IN NorTH AMERICA 359 
Lower sterile pinnae not dilated or auricled a 
the base; stipes 18-36 cm. long, with vestigial 
pinnae; costae flattened on the under side; 
vein spaces 10-13 to I cm.; indusium dark, 
only occasionally lacerate to the base, not 
concavely hollowed on the sides of the lacer- 
ations 
Rhizome scales broad, flaccid, without dark centers; ves- 
tigial pinnae * lacking; margins more or less serrate; 
membranous to rigid-herbaceous.t+ 
Sterile pinnae with rounded to tapering base 
Pinnae 2-5-jugate, 4-7.5 cm. long, ovate to ovate- 
lanceolate, with an acute apex. 
Pinnae 8-25-jugate, 9-26 cm. long, lanceolate to 
linear, with an acuminate apex. 
Margins conspicuously and irregularly erose; 
stipes red-purple; lamina not reduced at the 
apex 
pex. 
argins entire to finely serrate; stipes shining 
straw-colored to dull, pale brown; lamina re- 
duced at the apex in all except the smallest 
form 
Sterile pinnae a cordate, or rarely subcordate, bases. 
Stipes with vestigial pinnae, closely covered wit 
peculiar, appressed, amor phous scales, ordinary 
1 
0 
Stipes without vestigial pinnae, ordin res- 
ent, with or without fibrillose or somewhat 
formless appressed ones; n ous; 
With red-purple to black stipes; pinnae with 
an acute (or obtuse?) apex; lower fertile 
Pinnae usually with spurlike phanagiemee 
With straw-colored to chestnut stipes; pinn 
with an acuminate apex; lower batts 
pinnae usually without spurlike pro- 
tuberances 
Margins never revolute, but sharply, finely, 
and regularly cartilaginously serrate 
throughout 
Margins irfekalarly or fully revolute, defi- 
nitely serrate at the a 
ee scales narrow, short, 2-6 mm. 
ong, Store appressed finer ones 
inconspicuou il 
21. S. Underwoodiana. 
13. S. danaeacea. 
22. S. varians. 
17. S. Schiedeana. 
24. S. vivipara. 
23. S. violacea. 
14. S. falciformis. 
10. S. chiriquana. 
* Except j in S. vivipara 
+c PP oh In the emailer specimens of S. violeckes and one St. Vincent specimen of 
