56 
Ohio Biological Survey 
does not extend above it and sometimes becomes concolorous, giving a 
biatoroid appearance; exciple and hypothecium plectenchymatous, the 
latter 125 to 170 mic. thick; hymenium 140 to 175 mic. thick; asci clavate 
or rarely obclavate, 115 to 130 mic. long, and 25 to 35 mic. wide, with 
the walls 2 to 3 mic. thick laterally and 20 to 25 mic. thick at the apex; 
spores ellipsoid and sometimes pointed, longitudinally 8- to 12-celled, 
transversely 2- to 4-celled, 27 to 46 mic. long and 11 to 18 mic. wide. 
See Fig. 13. 
^^4dely distributed in the state, but rarely fruited. On rocks 
among mosses. Examined from areas about Eaton, Paint, Peebles, 
Oxford, Collinsville, Fultonham, Kelley’s Mills, Prospect, and Spring- 
field. 
3. Leptogium tremelloides (L.) S. F. Gray, Nat. Arr. Brit. PI. 2 \ 400. 
1821. 
Lichen tremelloides L. Suppl. PI. 450. 1781. 
Transforming the algal-host colony into a middle-sized, suborbi- 
cular body, which is 3 to 8 cm. across, 65 to 210 mic. thick, and 
rather closely adnate, with ascending and often imbricated lobes, with 
entire or finely undulate or dentate, crisped and irregular margins, with 
the upper surface lead-colored and beset more or less with isidioid 
branchlets, which may pass into minute lobules, with the lower surface 
somewhat lighter colored, and with the algal chains more numerous 
toward the upper surface; medulla of densely interwoven and uniformly 
distributed, vertically and variously disposed hyphse, which are 2.4 to 
2.7 mic. wide, often in part or wholly plectenchymatoid; cells of the 
upper cortex 5 to 10 mic. long and 5 to 8 mic. wide, those of the lower 
cortex scarcely differing in size; cortex several cells in thickness around 
and below the apothecia; rhizoids rarely seen in the sections; apothecia 
small to middle-sized, scattered, sessile or on a short pseudostipe, 0.5 to 
1.7 mm. in diameter; disk from slightly concave to slightly convex, 
brown, surrounded by an entire or an irregular thalloid margin, which is 
sometimes overgrown; exciple at least very largely of interwoven hyphse; 
hypothecium of interwoven hyphse, except perhaps at the lower limit, 
where it is plectenchymatous or plectenchymatoid, 80 to 100 mic. thick: 
hymenium 90 to 115 mic. thick; spores ovoid-ellipsoid to ellipsoid- 
pointed, longitudinally 4- to 6-celled, transversely 2- to 3-celled, 18 to 
32 mic long and 7 to 12 mic. wide. See Fig. 12. 
A rare plant in Ohio, the distribution of which is not well known. 
