ex. GENERA OF TEENS: 



transparent ferns. The species which have at different times 

 been separated under the names aboye quoted as synonyms, do 

 not appear to ns to present any generic differences. We admit 

 as distinct Feea and ffymenostacht/s with contracted fertile 

 fronds, the former haying free, the latter anastomosed veins. 



§ Eutriehomanea. — ^Involucres truncate, plane or spreading at the mouth. 



Ex. : T. r^iifoTme, Forst. 

 T. Tenosmn, S. Br. 

 T. glauco-fii&cnni, SooTc. 

 T. rigidum, jSr. 

 T. elongatnm, A. Cunn. 

 T. anceps, Sook. 



T. Bancroftij, Sk. and Grev. 



T. radicans, Sv. 



T. Kunzeannm, Sook. 



T. fcenicnlaceaiii, Sory. 



T. giganteum, £ory. 



T. trichoideun, Stc. 



§ Didtfrnogloggum, — ^InvohiCTes two-Kpped at the month. 



Ex. : T. reptans, Sw. 

 T. Filicula, Bojy. 

 T. quercifolimn, Sk. and Grev. 

 T. attenuatoin, Sook. 

 T. cTispnm^Xin. 

 T. Incens, 8ib, 



T. membranaeeum, Lin. 



T. intramarginale, Blc. and Gfrev. 



T. Krausii, JSk. and Grev. 



T, humile, Forst. 



T. c£spit<»uni, Sook. 



T. LambertianQm, Sook. 



The following groups have certain peculaiities in the arrangement of the 

 cel^ of their tissue^, which produce the appearance of their being traversed bj 

 obscure secondary veins. In other respects Abrodiciyun and UTeurophi/lliimy 

 belong to the § Eutrichomanes ; and Seuuphlehium to § Didymoglouu.m, 



* Ahrodicigom. — Yenuloid cells obliquely decurrent with the costa-like 



vein, and an intrama^jinal venuloid line. 



Ex. : T. Smithii, Sook, 



* Neur^hyUum. — ^Venuloid ceUs wavy, transverse between the veins. 

 Ex. : T. pinnatum, Sedio. | T. pennatum, Klfs. 



* SemvphUlnvm. — ^Yenuloid cells forming an intramarginal line, with re- 



current lines proceeding inwards between the veins. 

 Ex. : T. muscoides, 8w. \ T. pusiUnm, Sw. 



155. FEEA, Sory, Diet, aa^s. ^IRsf. Nat. yi. 446, t. 68- 



Tbichomaitis sp., Auct* ; HTUEirosTACHmis sp., Fresl. 



Sort involncrate, seated in extrorse-marginal cysts, placed on 

 the margins of contracted fronds, the veins continued into 

 filiform exserted clavat« receptacles, which are free within the 

 cysts, and bear sessile lenticular spore-cases at their base. Invo- 

 lucres free sub-pellucid club-fiinnel-shaped, truncate at the 



