(231) 
(1887). La Paz, 3300 meters, sterile specimens. There seems 
to be no specimen of A. orbiculatum (Mitt.), in the Mitten 
herbarium. It should not unlikely be referred to fi¢forme. 
A. prostratum (C. M.) Besch. is also, apparently, only a 
robust, elongated form of the same species. Cross-sections 
of stem and leaves of no. 2804 from Pelichuco are similar to 
those of European plants, as are cross-sections of no. 1081, 
Funck & Schlim, the type collection of A. prostratum. 
BRYUM FLEXISETUM Mitt. 
Between Sorata and Ingenio at 4500 meters elevation, Sept. 
27, 1902 (1899). Specimens with antoicous inflorescence 
and smooth spores up to 18 p. 
Bryrum MayEnsE Spruce. 
San Juan, on trail to Rio Lanca, March 22, 1902 (1723). 
BRYUM ARGENTEUM L. 
Near Pelichuco, 3100 meters elevation, April 30, 1902 
(2799). Near Ingenio, 4000 meters, Sept. 11, 190 (2900). 
Apolo, 1500 meters, July 10, 1902 (1894). Santa Cruz, 1500 
meters, April 24, 1902 (2800). The latter are the smallest 
specimens collected, growing in depressed tufts, with stems 
2mm. high and setaupto1cm. The finest specimens are 
from Pelichuco with stems up to 2 cm. high and the seta 2.5 
cm. 
Bryum concavum Mitt. 
La Paz, 3600 meters elevation, May 26, 1902 (1900). 
Springs of Yura, above Arequipa, Aug. 11, 1901 (2798). 
These specimens mostly have two short, inappendiculate cilia 
between the segments of inner peristome. Outer plates of 
teeth minutely granulose. Spores slightly roughened, up to 
20 4. These characters agree with those of the type collec- 
tion. No gemme noticed in any of the specimens. 
Bryum Atenense sp. nov. 
Dioicous; male plant simple, 4 mm. high with single 
terminal flower; outer perigonial leaves similar to stem 
leaves, inner much shorter, rotund-ovate with scarcely excur- 
rent nerve: fertile plants with stems 3 or 4 mm. long and few 
