The Collemaceae of Ohio 
53 
longitudinally 4-celled, becoming transversely 2-celled, 24 to 30 mic. long 
and 5 to 9 mic. wide. 
Collected near Peebles, by Bruce Fink, No. 94. On calcareous 
rocks. Not previously recorded for Ohio. 
5. Collema furvum Ach. Lich. Suec. 132, 236. 1798. 
Lichen fnrvns Ach. Lich. Suec. 132. 1798. 
Transforming the algal-host colony into a suborbicular or irregular, 
small or middle-sized body, which is 0.7 to 5 cm. across, 145 to 310 mic. 
thick, and loosely attached to the substratum, with rounded or somewhat 
irregular, entire and ascending lobes, which have undulate or crenulate 
and somewhat crisped edges, with the upper surface black-olive and cov¬ 
ered with granules, with the lower surface lighter colored, and with the 
algal chains somewhat more numerous toward the surfaces; thallus of 
densely and irregularly disposed hyphse, which are infrequently either 
perpendicular or horizontal to the surface, 1.3 to 5 mic. wide; rhizoids 
numerous at the points of attachment of the thallus to the substratum; 
apothecia small, few and scattered, sessile, 0.3 to 1 mm. in diameter; 
disk concave or flat, light brown, becoming dark, surrounded by an entire 
thalloid margin, which may extend slightly above it; exciple plectenchy- 
matous, hyaline; hypothecium plectenchymatous below, of interwoven 
hyphse above, 90 to 160 mic. thick; hymenium 105 to 120 mic. thick; 
asci 90 to 105 mic. long and 20 to 32 mic. wide; spores longitudinally 
4- to 6-celled, transversely 2- to 3-celled, 17 to 26 mic. long and 8 tO' 12 
mic. wide. See Fig. 13. 
Collected near Peebles, by Bruce Fink, No. 184. On calcareous 
rocks. Not previously recorded for Ohio. 
Leptogium Ach.; S. F. Gray, Nat. Arr. Brit. PI. i: 400. 1821 
Transforming the algal-host colony into a foliose, usually lead-col¬ 
ored or olivaceous body, which is variously lobed and sometimes granu¬ 
late or isidioid branched, and in which the algal-host chains are com¬ 
monly more numerous toward the upper surface of the colony; thallus 
of a plectenchymatous cortex surrounding a medulla which is mainly 
or wholly mycelial, or rarely more largely plectenchymatoid; hyphse of 
the medulla hyaline, straight or curved, for most part densely and vari¬ 
ously disposed, more or less branched monopodially; plectenchymatous 
cortex usually well developed and of a single layer of cells, except around 
and below the apothecia, where it is usually several layers of cells in 
