(255) 
Near Apolo, 1800 meters, on log, July 24, 1902 (2053). 
Near Aten, 1200 meters, on rock, Aug. 4, 1902 (2055). 
MICROTHAMNIUM OXYSTEGUM Spruce. 
San José to Apolo trail, on rock along stream, 925 meters, 
Feb. 5, 1902 (2037). 
MICROTHAMNIUM ANDICOLA (Hook.) Mitt. 
Apolo, 1500 meters, on bark of tree, July 7, 1902 (2032). 
Near Aten, on decayed log, June 19, 1902 (2090). San José 
to Apolo trail, Feb. 7, 1902 (2033). These specimens seem 
to be the same species as those of Weir, no. 279, Pacho, 6500 
ft., Andes Bogotense. The stem-leaves are about twice 
wider than any figures given by Hooker for this species in 
Musci Exot. Tab. 83. 
MICROTHAMNIUM REPTANS (Sw.) Mitt. 
Santa Cruz, 1525 meters, Aug. 24, 1902 (2045). Santa 
Barbara, on rock along stream, Aug. 29, 1902 (2011). 
Tumupasa, 430 meters, on rock, Jan. 10, 1902 (2046). Con- 
sata, 1220 meters, June 12, 1902 (2047). The following 
species is possibly scarcely distinct in having narrower, more 
gradually pointed stem-leaves. 
MicroTHAMNIUM Lanesporrri! (Hook.) Mitt. 
Between Apolo and Aten, 1600 meters, on old logs, Aug. 
6, 1902 (2087). San José to Apolo trail, on bark, Feb. 12, 
1902 (2950). Apolo, on damp, shady ground, April 17, 1902 
(2043). Ipurima, between San José and Apolo, Feb. 7, 1902 
(2949). Lower Rio Cocos, 925 meters, on bark, April 1, 
1902 (2044). MM. acrorrhizon (Hornsch.) Jaeg. evidently 
belongs under this species. Also M4. pendulinum (Hampe) 
Jaeg. 
EcTROPOTHECIUM AERUGINOSUM (C. M.) Mitt. 
Consata, 1220 meters, June 12, 1902 (2051). Near Aten, 
1100 meters, on wet sand by stream, July 27, 1902 (2052). 
EcTROPOTHECIUM VESCICULARE (Schwaegr.) Mitt. 
San Juan, Rio Asariamas, 1160 meters, on log, March 22, 
1902 (2028). San Buena Ventura, 190 meters, on rock along 
stream, Nov. 15, 1901 (2029). Santa Barbara, 1670 meters, 
on rock, Aug. 30, 1902 (2050). 
