54 TWENTY-EIGHTH REPORT ON THE STATE MUSEUM. 
/NTHALIUM GEOPHILUM 72. Sp. 
Effused in small irregular masses, whitish or yellowish, 
sometimes with a slight pinkish tinge; spores einaee, 
colorless, .00016’—.0002’ in diameter. 
Damp ground in woods. Sageville. August. 
The small size and colorless spores furnish the distinguish- 
ing characters of this species. 
DIDERMA FLAVIDUM 2. Sp. 
Ceespitose, small, external peridium thick, pale yellow or 
lemon color outwardly, white within, rupturing irregularly, 
inner peridium delicate ; flocci white ; spores black, globose, 
minutely rough, .0005’ in diameter. 
Among moss on decaying wood. Lake Pleasant. August. 
DIDYMIUM OXALINUM %. sp. 
Small, sessile, scattered or crowded, suhglobose or elon- 
gated and somewhat confluent, plumbeus ; peridium thin, 
clothed with a minute whitish mealiness, whitish when 
evacuated, tawny or reddish-brown within at the base; col- 
umella white, subglobose; flocci slender, colored ; spores 
globose, blackish-brown, with a purplish tinge, .00033’— 
.00035’ in diameter. 
Living leaves and petioles of wood sorrel, Oxalis Aceto- 
sella. Williamstown, Oswego commty. July. 
DIDYMIUM SUBROSEUM 2. Sp. 
Peridium subglobose, externally farinaceous, pinkish- 
white ; stem short, white, equal or slightly tapering upward ; 
flocci white ; spores globose, smooth, purplish-black, 00033’ 
in diameter. 
Bark of butternut trees, Juglans cinerea. Williamstown. 
uly. 
DIDYMIUM FLAVIDUM %. sp. 
Peridium subglobose, sessile, thin, yellow, clothed with 
a minute yellow mealiness ; spores subglobose, black, .0004’ 
in diameter. 
Bark of dead balsam trees, Abies balsamea. North Elba. 
August. 
DicTyDIUM UMBILICATUM Schrad. 
Decaying wood. North Greenbush. June. 
