6S2 FILICES. 



Ml. t. 28.— Acrostichum, L. Polypodimn, Sw. Gleichenia, Spreng. M. bifida, W. {Act. 

 Holm. 1804. t. 5. B., agreeing with G. dichotoma, PI. Lechl. 2040) : a form with the Ipafy 

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

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

 leafy portions 3"-5", segments 6"'-10"' long, the latter 1'" broad beyond the base.— Hab. 

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

 and South Brazil]. 



19. la. farinosa, Kaulf. Petiole g-3-chotomous : leafy portions but once forked, 

 pinnatiparlite, oblong-linear, fapering at both ends : ultimate forking much longer than the 

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



I dilated at the base, puterutous beneath or glabrous; son of 3-5 sporangia near the simple 

 forking of the veins.— ^«e. Analect. t. 3. Hook. Spec. 1. t. 7. B.— Gleichenia Mathewsii, 

 Hooh. M. pubescens, W., sec. KL, Mat. in PI. Wr. .'— li'-2' high ; ultimate leafy portions 

 5"-13", segments 6"'~8"' long, the latter 1'" broad beyond the base. — Hab. Jamaica!, Pd-i 

 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 but once forked, 

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

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



I linear, bluntish, equally dilated at the base, rusty-tomentose beneath ; sori of 4-3 sporangia 

 near the simple forking of the veins. — Hook. Grev. le. t. 15. — M. furcata, <S»ei. Mart. 234. 

 M. pubescens, Liebm. Gleichenia immersa, if ooA. Grev. {exelus. synon.). G. longipinnata. 

 Hook, {ex descr.).—i'-5' high; ultimate leafy portions i'-Zi', most segments li"-l" 

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



** Veins S-4t-fid (Dicranopteris, £emh.). 



21. M. pectiqata, W. Petiole 8-3-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, often glaucous (rarely hairy) beneath ; 

 sori of 8-10 sporangia on one branchlet of 3-4-fid veins. — Willd.i'n Act. Holm.\ifM. 

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

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

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

 [French islands I, 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. — Sohk. Crypt, t. 148. — 

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

 ments 10"'-4"' long, the latter l"'broad.^HAB. Trinidad !, iocM. ; [Cuba! to French 

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



Tkibe IV. HtMSNOPHTLLEJE, '^nSi.—^orangia with a complete, transverse (rarely 

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

 column. 



8. TRICHOMANES, L. 



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

 • 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 pelkicid- 

 memiranaoeous, devoid of stomata : veins mostly free, sometime connected by streaks of 

 ■ special, prosenehymatic tissue. 



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

 deeply pinnatifid : veins diehotomous {Jeea, Bory). 



23. T. spicatum, Hedw. leaves csespitose, sterile deeply pinnatifid, shortly petioled, 

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



