652 FILICES. 



Fil. t. 28.— Acrostichum, L. Polypodium, Sw. Gleichenia, Spreng. M. bifida, W. (Act.- 

 Holm. 1804. t. 5. B., agreeing with G. dichotomy PL Leckl. 2040) : a form with the leafy 

 portions but once forked (or simple), but distinguished from the two following species by the 

 inferior fork as long as the superior, both equally pinnatipartite. — 7 '-8' high (SI.) ; ultimate 

 leafy portions 3"-5", segments 6"'-10"' long, the latter V" broad beyond the base.— Hab. 

 Jamaica (Sw.), forming thickets in the mountains ; [French islands, and Mexico to Peru, 

 and South Brazil]. 



19. M. farinosa, Kaulf. Petiole 2-3-chotomous : leafy portions but once forked, 

 piuuatipartite, oblong-linear, tapering at both ends : ultimate forking much longer than the 

 short penultimate one, the latter naked below on one side : segments linear, blunt, equally 

 dilated at the base, puberulous beneath or glabrous ; sori of 3-5 sporangia near the simple 

 forking of the veins.— Kze. Analect. t. 3. Hook. Spec. 1. t. 7. B.— Gleichenia Mathewsu, 

 Hook. M. pubescens, W., sec. KL, Eat. in PI. Wr. !—\\'-2' high ; ultimate leafy portions 

 5"-12", segments 6"'-8'" long, the latter 1'" broad beyond the base.— Hab. Jamaica!, Pd., 

 AL, on the summit of the Blue Mountains ; Dominica !, Imr. ; Trinidad !, Cr. ; [Cuba ! and 

 Mexico to Peru]. 



20. M. longipinnata, KL Petiole 2-3-chotomous : leafy portions hut once forked, 

 pinnatipartite, linear -oblong, gradually tapering towards both ends : ultimate forking long, 

 much longer than the short penultimate one, the latter naked below on one side : segments 

 linear, bluntish, equally dilated at the base, rusty-tomentose beneath ; sori of 4-2 sporangia 

 near the simple forking of the veins. — Hook. Grev. Ic. t. 15. — M. fmc&iz, Sieb. Mart. 234. 

 M. pubescens, Liebm. Gleichenia immersa, Hook. Grev. (exclus. synon.). G. longipinnata. 

 Hook, (ex descr.). — 4 '-5' high; ultimate leafy portions ]'-2#% most segments lfj-1 

 long. — Hab. Dominica !, S. Vincent !, Guild. ; [French islands ! and Mexico ! to Brazil !J. 



** Veins 3-4-fd (Dicranopteris, Bernh). 



21. M. pectinata, W. Petiole 2-3-chotomous and ultimately branched : leafy portions 

 simple, geminate, pinnatipartite : each pair at the summit of a slightly margined, partial 

 petiole : segments oblong-linear, emarginate, glabrous, ofteu glaucous (rarely hairy) beneath; 

 sori of 8-10 sporangia on one hranchlet of 3-4-fid veins. — Willd.in Act. Holm. ioOi. 

 t. 4. Hook. Grev. Ic. t. 14. — Gleichenia, Prl. M. glaucescens, W. — Trailing, often 20- 

 30' long (Pd.) ; leafy portions 6"-8", segments 4"'-12'" long, the latter H"'-2"' broad.— 

 Hab. Jamaica!, Pd., AL, S. Anns, Blue Mountains; Dominica, S. Vincent!, Guild.; 

 [French islands !, and Mexico to Brazil !]. 



22. M. dichotoma, W. Petiole repeatedly 2(-3)-chotomous : leafy portions simple, 

 geminate, pinnatipartite : one pair at the summit of each cylindrical, partial petiole, other 

 portions opposite at the superior bifurcations ; segments linear, emarginate or blunt, gla- 

 brous ; sori of 6-10 sporangia on one branchlet of 3-4-fid veins.— Schk. Crypt, t. 148.— 

 Gleichenia, Hook. G. Hermanni, R. Br. — 1'-3' high ; leafy portions usually 4"-8 , seg- 

 ments 10"'-4'" long, the latter 1'" broad.— Hab. Trinidad !, Lockh. ; [Cuba! to French 

 islands !, and most tropical countries of the globe]. 



Tbibe IV. HYMENOPHYLLEM, Endl.— Sporangia with a complete, transverse (rarely 

 oblique) ring about the middle, longitudinally dehiscent, inserted into an industate 

 column. 



8. TRICHOMANES, Z. 

 Sori marginal : indusium inferior, tubular, usually sunk into the leaf or margined : lim 

 subentire or 2-lipped : column usually filiform, exserted, fertile at the base, inserted at the 

 forking of a veinlet, the branches of which run into the indusium. — Leaf mostly peUucta- 

 membranaceous, devoid of stomata : veins mostly free, sometimes connected by streaks oj 

 special, prosenchymatic tissue. 



§ 1. Indusiafree along the whole margin of a narrowly, linear, special leaf. — Sterile leaves 

 deeply pinnatifid : veins dichotomous (Feea, Bory). 

 23. T. spicatum, Hedw. Leaves caespitose, sterile deeply pinnatifid, shortly petioled, 

 fertile ones exserted, narrowly linear, shorter than their slender petiole : sterile segments 



