ASPLENIE^ — ASPLENIUM. 77 



in which tlie sorus curves across it. Ferns of the most various form, 

 simple to finely dissected, growing in all situations, and all over the 

 world. As construed here, it includes several sections the types of some 

 of which are different enough to have been generically separated, but 

 whose characters intergrade. Through § Athyrium it is closely related 

 to Diplazium. 



1. § Neottiopteris; frond simple, usually entire, elongate. 



2. Veins connected near margin (Thamnopteris) (1) A. Nidus 



2. Veins as a rule free. 



3. Frond entire, more or less coriaceous. 



4. Indusium leaving a ridge at dehiscence (2) A. scolopendrioides 

 4. Indusium not leaving a ridge. 

 5. Stipe scaly. 



6. Frond acuminate or cau- 

 date (3) A. sqiiamulatum 



6. Frond merely acute (4) A. apoense 



5. Stipe naked (5) A. vittaeforme 



3. Frond serrate, membranaceous (6) A. epiphyticum 



1. ^ Euasplenium; once or more pinnate, veins forked in 

 segments, sori confined to one side of vein. 

 2. Frond once pinnate. 



3. Pinnae deep, not narrower than oblong. 

 4. Rachis green, at least in part. 



5. Rachis pubescent (7) A. loherianum 



5. Rachis glabrous. 



6. Pinnae auricled, frond nar- 

 row (8) A. toppingianum 



6. No auricles, frond broad .. (9) A. subtiormale 



4. Rachis glossy, nearly black (10) A. normale 



3. Pinnse usually linear-oblong or linear. 



4. At least half of lower side of pinna 



cut away (ID -A- resectum 



4. Pinnae equal sided at base. 



5. Herbaceous, dark green (12) A. multilineatum 



5. Coriaceous, pale green (13) A. wightianum 



4. Upper side of base of pinna; nearly 

 parallel with main rachis, lower side 

 obliquely truncate. 

 5. Veins conspicuous. 



6. Frond herbaceous, dark 

 green. 

 7. Apex of pinnae round- 

 ed (14) A. tenerum 



7. Apex of pinnae obtuse 

 or acute. 

 8. Inciso crenate 



throughout .... (15) A. Umulatum 

 8. Upper side lobed 



at base (16) A. Stcerei 



7. Apex of pinnae acu- 

 minate. 

 8. Veins usually 



simple (17) .4. prionurus 



8. Veins forked .... (18) A. persirifolium 

 6. Frond firmer, pale green. 



7. Pinnules broad (19) A. gtiaeuin 



7. Pinnules narrow (20) A. hirtum 



