10 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 
KEY TO SPECIES. 
Growing on earth; squamulose. 
Whitish to light gray......2. 0.0. ee 3. E. lepidallum. 
Some shade of brown. 
Pale brown; squamules roundish to oblong............... 1. E. pusillum. 
Reddish brown; squamules roundish.....................2. H. subnitescens. 
Growing on rock; thallus minutely squamulose. 
Black, small, round, discrete or in confluent patches..........4. EH. wilmsoides. 
Olivaceous-cinerascent, effuse........2..200....00 22. eee eee 5. E. monicae. 
1. Endocarpon pusillum Hedw. 
Thallus of pale brown or dusky buckskin-colored squamules, roundish to irregularly 
oblong, entire or flexuous, closely adhering to the substrate, 1 mm. in diameter, or 2. 
mm. long by 1.5 mm. to 2 mm. wide; apothecia marked by a darker colored slight 
projection, mostly several in a squamule, the aperture minute; on section the perithe- 
cium and contents seen dark, globular; asci cylindric-clavate, the membrane thick, 
gelatinous, indistinct; paraphyses none; spores in 2’s, from colorless to light brown 
and brown, muriform-multilocular, 11 or 12 loculi in the long spore axis and 3 or 4 in 
the short transverse axis; spores varying in form from ellipsoid to oblong, 32 to 44 
long, 13 to 20 » thick. 
On earth in open places near the Soldiers’ Home, Santa Monica Mountains; also near 
San Bernardino, Parish. Eastern and southern United States and Europe. 
2. Endocarpon subnitescens Nyl. 
Thallus squamulose, the squamules 1 to 3 mm. wide, reddish brown, thin, 
lobulate, adherent to the substrate; one to several apothecia immersed in a squamule, 
their location marked by a brown convexity, the ostiole not discernible; asci 140 p 
long, 60 » thick, the membrane gelatinous; spores in 2’s, colorless to pale yellowish, 
muriform, 46 to 80 p long, 18 to 28 « thick; hymenial gelatine with iodine pale claret. 
On earth in the Santa Monica Mountains. 
3. Endocarpon lepidallum Nyl. sp. nov. in litt. 
Thallus of small squamules (0.25 mm. to 2 mm. wide), from whitish to pale smoky 
gray, at first round, later flexuous and lobed, the margin finely granular and blackish, 
when dry the squamules slightly concave with the margin turned upward; squamules 
containing from 1 to about 12 apothecia, these immersed, only a minute gray protuber- 
ance with a barely discernible ostiole marking them; perithecium dark, dimidiate, 
black under the hand lens, brown black under a higher power, 52 to 56 p thick, the 
thecial cavity 140 to 160 » in diameter; asci 60 # long, 20 » thick, the apical perforation 
vertical, widening upward, funnel-shaped, the membrane quite thick but gelatinous 
and almost invisible; paraphyses none; spores in 2’s, ovoid to oblong and ovoid- 
ellipsoid, at first colorless, later pale brown, 28 to 40 It long, 14 to 18 » thick, muriform 
with 8 loculi in the longitudinal spore axis, and 3 or 4 in the transverse, the cells cubic; 
hymenial gelatine vinous red with iodine, the ascus membrane faintly go and its con- 
tents rich yellow to orange, sterigma indistinctly articulate, somewhat c urved, 
spermatia minute, barely 1» long. The lower surface of the thallus is ecorticate; the 
upper has a cortex of horizontally flattened cells immediately beneath, these forming 
the gonidial layer. 
On earth in open places. ‘Type locality, foothills of the Santa Monica Mountains 
near the Soldiers’ Home. 
Type deposited with the late Dr. W. Nylander; duplicates in the U. 8. National 
Herbarium, the herbarium of the New York Botanical Garden, and herb. Hasse. 
4. Endocarpon wilmsoides Zahlbr. Beih. Bot. Centralbl. 18: 152. 1902. 
Thallus of discrete or confluent small, round patches, 3 to 8 mm. in diameter, 
minutely rimulose, sooty olivaceous in color; apothecia solitary or 2 in the minute 
a 
