[Vor. 5 
126 ANNALS OF THE MISSOURI BOTANICAL GARDEN 
slender mycelial strands white when young, becoming chest- 
nut-brown, running along the twigs and petioles to the leaves 
and fructifying there; fructifications at first downy and 
barely visible, soon thickening into a dirty pinkish buff, felty 
membrane covering the whole under side of the leaf and fre- 
quently separable from it as a whole by mere handling; 
hyphae hyaline or slightly colored, giving their color to the 
fruetifications, even, thin-walled, not inerusted, not nodose- 
septate, 41—73 и in diameter; basidia scattered along the 
hyphae on short lateral branches, simple, 117-8 p, with four 
short sterigmata; spores hyaline, flattened or slightly con- 
cave on one side, 8-11Х23-4 y. 
00 
"E / 4 
nm 
Fig. C. Stevensii. From specimen from Trinidad, 
ее *a һурһа; а1, basidium; a2, spores; a3, young ba- 
sidium 
Fructifieation 11 em. long, 3-4 em. broad, 45-60 д thick, un- 
broken over whole under surface of leaves; sclerotia 3-4 mm. 
in diameter; mycelial strands 1-1 mm. in diameter, many em. 
long. 
On apple, pear, and quinee, in Brazil and southern United 
States, causing the leaves to dry and fall, and on Codiaeum 
in Trinidad. 
This species differs from Corticium koleroga by having 
sclerotia and thicker, darker-colored, and more felted fructi- 
fications which are but feebly attached to the leaf and form 
an unbroken covering over the whole under surface of the 
leaf from margin to margin. Fruiting specimens of this 
fungus have been available for study from only two local- 
ities, but these specimens agree in the characters stated above. 
