242 Alexander W. Evans, 



densely imbricated scales in several rows: female receptacle 

 borne on a stalk 6-8 cm. long (when well developed), with two 

 rhizoid-furrows and a single broad dorsal band of air-chambers, 

 the disc mostly 1.2- 1.6 cm. broad, deeply lobed, the lobes or rays 

 spreading at maturity, mostly eleven (sometimes nine or ten), 

 5-6 mm. long, the two basal rays usually shorter than the others 

 and separated by a wider sinus, rays terete, rounded at the apex, 

 destitute of surface-papillae; involucre sometimes pigmented, 

 deeply and irregularly lobed, the lobes long-acuminate and dentate 

 to ciliate on the sides: spores pale yellow, 12-14/x in diameter, 

 smooth or nearly so ; elaters 3-5/x wide, bispiral : cupules deeply 

 lobed, the lobes as in M. polymorpha, outer surface with epidermal 

 papillae. (Figs. 3, 4.) 



The species seems to be confined to the high mountains of 

 South America. The following specimens have been examined: 



Colombia: Boqueron, Bogota, W. Weir (N. Y.). 



Ecuador: Quito, December, 1847, ^- Ja^neson (N. Y., listed by 

 Mitten as M. Berteroana in Jour. Hot. & Kew Misc. 3:361. 

 1 851); Pichincha, R. Spruce (distributed in Hepaticae Spruce- 

 anae). 



Peru: Cuzco, July, 191 1, H. W. Foote (Y., listed by the 

 writer as M. lamellosa in Trans. Conn. Acad. 18 : 299. 1914) ; 

 same locality, September, 1914, Mr. & Mrs. J. N. Rose ipodo 

 (N. Y., Y.) ; Ollantaytambo, May, 191 5, Cook & Gilbert 672 

 (U. S., Y.) ; San Miguel, Urubamba Valley, June, 191 5, Cook 

 & Gilbert 1162 (U. ,S., Y.) ; Lucumayo Valley, June, 1915, 

 Cook & Gilbert 1321 (U. S., Y.). 



Bolivia: between Chupe and Janacache, province of Yungas, 

 A. d'Orbigny 209 (M., type) ; Sorata, February, 1886, H. H. 

 Rusby S005 in part (N. Y., listed by Spruce as "M. plicata 

 Nees?" in Mem. Torrey Club 1:140. 1890); Songo, Novem- 

 ber, 1890, M. Bang pio (N. Y., U. S., Y., listed by Rusby as 

 M. polymorpha in Mem. Torrey Qub 4:274. 1895); Sorata, 

 September, 1901, R. S. Williams 2144 (N. Y., Y.). 



The type specimen of M. lamellosa was collected at the fol- 

 lowing locality : 



Venezuela: Paramo de Mucuchies, Moritz 45 (listed, but 

 erroneously ascribed to Colombia, in Syn. Hep. 527. 1846; also 

 listed by Hampe in Linnaea 20 : 333. 1847) . 



