LINDMAN, AMERICAN SPECIES OF TRICHOMANES SM. 



29 



The fernherbarium in Stockholm possesses numerous in- 

 dividuals of this species. "W'ithout a magnifying-glass it 

 would be very difficult to distinguish this plant from Tr. 

 Kraussii, but when slightly magnified, it offers at once many 

 peculiarities and a very striking appearance. As the origi- 

 nal description (Baker, Syn. Fil., ed. 2, p. 465) is rather 

 short, and the plant, which is only known from Spruce's col- 

 lection (n. 5354), was earlier confounded with Tr. Kranssii, I 

 think an illustration and a fuller description are desirable. 



The rhizome is exceedingly stout and densely tomentose. 

 The short stipes is also tomentose below, the upper half 

 il cm) naked and flattened. The frond is rigid and as dry 



Fig. 16. Trichomanes melanopufi Bak., specimens from Ecuador. Spruce n. 



5354: A a small portion of an old frond, partially bipinnatifid, with the main 



Costa: B apex of a sterile frond: C apex of an ultimate lateral segnient half 



way up from the base of the frond (X 5). 



corrugated altogether, but somewhat shining, yellowish or 

 nekrly reddish; the length is 2 — 5, the width 1,.-. — 2,5 cm. The 

 primary segments are almost horizontal and some of them 

 considerablj' lengthened, simple, or pinnatifid again; the nar- 

 rower segments and all ultimate ones are densely crenate or 

 moniliform. The venation is quite peculiar: the midrib stout 

 and rather straight, secondary veins very flexuose, all ulti- 

 mate venules very short, rising at a nearly right angle and 

 then incurved to the margin; spurious veinlets very few and 

 short. Marginal hairs very long. The cells are middle-sized, 

 about 0,050 — 0,075 mm long; the walls only 0,oo4 — 0,ooc mm 

 thick, fig. 15, B. 



