( 233) 
rostratum I have seen, measuring up to 8 mm. long and 3.5 
mm. wide. The largest European specimens measured were 
6 by 3 mm. Also the Bolivian plants have large hyaline 
cells, up to 35 # wide and 55 u long, on either side of costa 
the greater part of its length, a character not noticed in ros- 
tratum. The apex of leaf varies considerably in all the 
specimens, and does not offer any constant difference. 
RHIZOGONIUM SPINIFORME (L.) Bruch. 
Apolo, 1600 meters, July 7, 1902 (1854). Common in the 
region of Apolo from 1200 to 1800 meters on fallen trunks 
and roots of trees. 
LeiomeLa BartrramiorpeEs (Hook.) Par. 
Near Aten, Aug. 16, 1902, 1500 meters (1769). 
BaRTRAMIA ITHYPHYLLOIDES Schimp. 
Pelichuco, 3100 meters, April 30, 1902 (2824). 
BaRTRAMIA FRAGILIFOLIA C. M. 
Tacacoma, 3050 meters, June 10, 1902 (1908). 
PHILONOTIS TENELLA (C. M.) Besch. 
Tumupasa, 430 meters, Dec. 12, I901 (1917). 
PHILONOTIS MINUTISSIMA (C. M.) Par. 
Isapuri, Rio Mapiri, 450 meters elevation, Oct. 1, 1901 
(1916). Apolo, 1500 meters, on dry soil, July 10, 1902 
(1913). Rio Pelichuco, 2400 meters, April 27, 1902 (2826). 
Sorata, 2300 meters, Sept. 4, Ig0I (2936). 
Philonotis operta sp. nov. 
Dioicous ; male plants slender with few branches and bud- 
hike flowers, the perigonial leaves from a golden-brown, 
ovate-concave base to a gradually narrowed, long- fees 
serrulate, erect point, indistinctly costate: fertile plants 
soft low mats, densely tomentose within, with short ees 
(under rt cm. long), in cross-section slightly elongate-pen- 
tagonal, 180 in greater diameter, the rind of two rows of 
thick-walled cells and an outer row of thin-walled, medium- 
sized cells, often collapsing and indistinct; central stand 
rather small with poorly marked border; the very slender 
