[From the Bulletin of thb Torrey Botanical Club, 40: 687-690. 6 J 1914.] 



New ferns from tropical America — I 



Margaret Slosson 



(with plate 26) 



ia« 



Trichomanes rhipidophyllum Slosson, sp. nov. 



Rhizome creeping, about 5 mm. in diameter, thickly tomentose; 

 stipes brown and tomentose to within about 1 mm. of the lamina, 

 then green, slightly hairy, and winged by the narrowly and 

 abruptly decurrent base of the lamina, in fertile fronds 5-7 mm. 

 long, in sterile 1.5-3 mm. long; laminae shining bright green, 

 delicately papyraceous, the fertile 0.8-1. 1 cm. long, 0.7-1.3 cm. 

 broad, suborbicular, almost semicircular, or subtrapezoid, at 

 apex slightly once cleft, at base subtruncate or cuneate, the sterile 

 0.4-1.3 cm. long, 0.5-1.5 cm. broad, round-reniform to ovate or 

 broadly obovate; margins irregularly undulate or sublobate, 

 marginal hairs few, slender, simple or 

 binate ; surfaces or at least the lower one 

 with a few short club-shaped mostly 

 2-celled hairs on the veins; veins few, 

 distant, in the sterile fronds subnabel- 

 lately forked, midveins of fertile fronds 

 flexuose, with about 3 pairs of branches 

 forked 1-4 times, spurious veins short, 

 almost none ; cells of the lamina between 

 the veins variable, mostly narrow, 0.056- 

 0.116 mm. long, 0.020-0.040 mm. broad, 

 their walls 0.004-0.008 mm. broad; in- 

 volucres 1-2, borne at the base of the 

 central cleft of the lamina, almost wholly 

 exserted, the lips 1.5 mm. broad, their 1, cellular structure of the mar- 

 brown border 1-4 cells deep; spores glo- s in of the 1£ p of the involucre. 



bose, O.O44-O.O56 mm. in diameter. enlarged; 2, cells from between 



_ . , tt 1 1 tt 1 the veins of a sterile frond, very 



Type in the Underwood Herbarium much enlarged 

 at the New York Botanical Garden, 



collected on a tree in a damp forest near Onaca, Colombia, at 

 an altitude of 760 m., Aug. 24, 1898-99, Herbert H. Smith 2445. 

 A note on the label says "not observed elsewhere." A very 

 distinct species belonging to the section orsubgenus Didymoglossum 



687 



{VHP 



new 





Trichom anes rhipidophyllum. 



