WILLIAMS: PANAMA MOSSES 35 
PRIONODON DENSUus (Sw.) C.M. Williams 1062, Cana. 
ORTHOSTICHOPSIS TETRAGONA (Sw.) Broth. Walliams 1069, 
Cana at 900 to 1200 m. elevation and 1078, Marraganti, 15 to 
30 m. elevation. 
LINDIGIA ACICULATA (Tayl.) Jacq. Williams 1055, Cana. 
METEORIOPSIS RECURVIFOLIA (Hornsch.) Broth. Williams 
1067, Cana at about 90 m. 
METEORIOPSIS PATULA (Sw.) Broth. Williams 1079, Mar- 
raganti, 15 to 30 m. elevation. 
PHYLLOGONIUM FULGENS (Sw.) Brid. Williams 1044, Cana, 
1200 to 1800 m. alt. A slender form, var. gracile Ren. & Card. 
PHyYLLOGONIUM viscosuM (Palis.)Mitt. Williams 1045, Cana 
at 1500 to 1800 m. 
NECKERA UNDULATA (Palis.) Hedw. Williams 1050, Marra- 
ganti, 30 to 60 m. elevation, April, 1908. 
NECKERA DISTICHA Hedw. Williams 1049, Marraganti, 30 
to 60 m. elevation. 
POROTRICHUM COBANENSE C.M. Williams 1053, Cana, April, 
1908. 
PILOTRICHUM AMAZONUM Mitt. Williams 1105, Marraganti, 
April, 1908. 
These seem to be the only specimens obtained of this species 
since the type was collected by Spruce on the Amazon. 
Stereophyllum Howei sp. nov.- 
Autoicous: antheridial buds on stem near the fertile flowers, 
about 0.5 mm. high, the perigonial leaves ovate, more or less 
acutely pointed and serrulate with costa often faint, enclosing 
4 or 5 antheridia without paraphyses; in thin mats with creeping, 
somewhat branching stems mostly without radicles, about I cm. 
long; stem leaves mostly 1 mm. long and 0.4 mm. wide, much 
compressed, inequilateral, elongate-ovate or somewhat lingulate, 
obtusely or sometimes acutely pointed, smooth on both surfaces, 
serrulate one half their length or more with flat margins except 
on narrower side in basal part; costa extending to a little above 
the middle; leaf cells mostly narrowly linear and somewhat ver- 
micular, the median about 4 wide and 40 to 80y long, the 
alar sometimes scarcely differentiated or of pale, rectangular to 
nearly square cells, mostly not very numerous; perichaetial leaves 
