9. TRICHOMANES. 83 



less immersed in the margin, the mouth truncate, dilate or 2-lipped. Recep- 

 tacle mostly long and exserted, prominent beyond the sporangia. Surfaces of 

 the sporangia divided into few, unequal cells. 



Rhizome creeping or erect. Fronds simple or divided, varying from deli- 

 cately membranaceous to (rarely) +. coriaceous; ultimate segments mostly 

 linear or oblong, rarely ovate or rhomboidal, sometimes capillary. Hk. Bk., 

 Syn. Fil, tab. II, fig. 17; Diels, in Engl. & Prantl, Nat. Pn.Fam., 1*, fig. 73. 



Tropical, rarely extra-tropical. 



Arrangement of the sections and groups. 



% 1. F£EA. Fronds dimorphous, the fertile ones spicate. Diels, in Engl. & 

 Prantl, Nat. Pfl.Fam., I*, fig. 73, D. (Not in Malaya). 



§ 2. EUTRICHOMANES. Fronds uniform, the fertile ones not spicate. Ulti- 

 mate segments flattened, often narrovfly linear, but not capillary. Diels, 

 1. c, fig. 73, A— C; Christ, Farnkr. d. Erde, fig. 34—54, 73. 



a. Cardiomanes. Frondssimple,reniform; veins flabellate; spurious 

 veins wanting. Sori pantotactous (*). (Not in Malaya). 



b. Hemiphlebium. Fronds simple or slightly lobed, not reniform ; . 

 spurious veins present. Sori epitactous (*). 



c. Gronocormus. Fronds digitato-subdichotomous (*); sori para- 

 tactous ('). c\^c.\, ,3 ^r^ 



d. Ptilophyllnm. Fronds pinnately divided, the main rachis winged 

 throughout or towards the base only. Cells of the texture roundish, 

 oblong, quadrangular or subhexagonal, not placed as in e. Sori epi- 

 tactous or paratactous. 



e. Abrodictyum. Fronds pinnately divided, the main rachis whether 

 or not winged. Cells of the texture transversally oblong, placed in 

 obliquely longitudinal rows. Sori paratactous. (V. D. B., Hymen. Jav., 

 tab. XII, Habrodictyon). 



f. EiaeoStea. Fronds pinnately divided, the main rachis not winged 

 or winged towards the apex only, but often narrowly marginate. 

 Cells of the texture as in d. Sori paratactous. 



(') Prantl, Morph. d. Gefasscr., [, Hymen., 7. 

 (') Prantl. 1. c, 11. 

 (•) Prantl, 1. c, 8. 



(') Fronds digitate, the segments simple or once or more times forked, the central seg- 

 ment not rarely elongate and pinnatifid with simple or divided secondary segments. 



