72 17. TKICHOMANES, FEEA, EUTRICHOMANES. 



1. T. elegans, Rudge ; caud. erect, tufted ; sterile fr. 6-8 in. L, 2 in. br., on st. 

 2-3in.l.,pinnatifidnearly to the rachis, with finely-toothed linear-oblong segments, 

 the veins anastomosing, the apex often rooting and proliferous ; fertile fr. 6-12 

 in..l., about ^ in. br., on st. 4-8 in. 1. ; sori placed in close rows along both mar- 

 gins, the tube quite sunk, the mouth not at all dilated. Hk. Sp. 1. p. 114. 

 Gard. F. t. 2. Hymenostachys diversifrons, Bory. Feea Boryi, V. D. B. 



Hab. Tropical America, from Trinidad and Mexico southward to Peru. The earlier 

 named T. elegans, Kichard, is T. Prieurii, Kuuze. 



2. T. botryoides, Kaulf. ; caud. erect, tufted ; sterile fr. 2-3 in. L, 1 in. or 

 rather more br., on very short st., pinnatifid to a slightly winged rachis, with 

 linear-oblong deeply- toothed lobes, the apex rooting and copiously proliferous ; 

 veins free ; fertile fr. on st. 1-2 in. 1., narrowly linear, the lower sori stalked, 

 usually free, the upper connected at the base, and the apex of the frond foliaceous. 

 T. nanum, Bory. Hk. Sp. 1. p. 115. 



Hab. Tropical America ; Guiana, Leprieur & Appun ; Panama, Seemann. Quite inter- 

 mediate in the character of the fertile frond between elegans and spicalum, and more 

 delicate in texture than either. 



3. T. spicatum, Hedw. ; caud. erect, tufted ; sterile fr. 4-6 in. 1., 1-1 in. br., 

 on st. 1-2 in. L, pinnatifid nearly to the rachis, with inciso-crenate linear-oblong 

 segments ; veins free ; the apex not rooting ; fertile fr. composed of a rachis and 

 two rows of sori, without any connecting membrane ; tube obconico-cylindrical, 

 firm in texture, mouth not dilated. Hk. Sp. 1. p. 114. Gard. F. t. 60. Feea 

 polypodina, Bory. 



Hab. West- Indian Islands, frequent ; Panama, Guiana, and Ecuador. Maschalosorus 

 Mougeoti, V. D, B., is an abnormal state, with the sterile and fertile frond combined. 



4. T. heterophyllum, H. B. K. ; rhizome creeping, widely ferrugineo-villose ; 

 sterile fr. 2-4 in. 1., 1-1^ in. br., on st. 1 in. or less L, pinnatifid to a narrowly 

 winged rachis, with closely-placed imbricated sinuato-pinnatind crisped oblong 

 pinnae ; veins free ; fertile fr. on villose wiry st. 6-8 in. L, the frond 2-3 in. L, 

 about ^ in. br., subcoriaceous in texture, linear-oblong, pinnatifid down to a 

 broadly-winged rachis ; the lobes oblong, pinnatifid about halfway to the midrib ; 

 sori 4-6 to each pinna, terminal on the upper ultimate segments ; the tube quite 

 sunk in the frond, the mouth not dilated. T. Spruceana, Hk. Ic. PL t. 981 . 

 Feea Humboldtii, V. D. B. 



Hab. Tropical America; Essiquibo, Schoiriburghk ; N. Brazil, Spruce. Connects in 

 habit this dimorphous-frouded group with T. crispum. 



Eutrichomanes.J Sterile and fertile fronds uniform or nearly so. Sori not 

 spiked. 



* Fronds entire or slightly lobed. Sp. 5-20. See also No. 60 & 46. 



t Fronds without a distinct central midrib, but with veins radiating from the base 

 as in a fan. Sp. 5-13. 



This includes numerous genera of Presl and Van den Bosch, founded primarily on 

 the texture of the frond (whether it is composed of one or more than one layer of cellules ;) 

 secondarily, upon whether the mouth of the involucre is entire or two-lipped, and after- 

 wards in the degree to which the frond is divided, and the character of the venation. 



