The Collemaceae of Ohio 
51 
varyiiij^ toward black, with the lower surface scarcely lighter colored, 
and with the algal chains more numerous toward the surfaces; thallus of 
scattered or rather densely disposed hyphse with course largely irregular, 
but roughly horizontal toward the center, 1 to 4 mic. wide; rhizoids 
numerous at the scattered points of attachment; apothecia common, small 
to middle-sized, adnate or sessile, 0.6 to 2.5 mm. in diameter; disk concave 
to slightly convex, red-brown, surrounded by an entire or rarely crenate 
thalloid margin, which extends above it, or is rarely overgrown; exciple 
thin, of interwoven hyphse, tinged with brown; hypothecium of inter¬ 
woven hyphse, tinged with brown, 40 to 80 mic. thick; hymenium 90 to 
125 mic. thick; asci 70 to 90 mic. long and 11 to 21 mic. wide; spores 
longitudinally 4- to 5-celled and transversely 2-celled, 17 to 32 mic. long 
and 6 to 11 mic. wide. See Figs. 9, 13, 15, 16, and 21. 
Widely distributed in southern Ohio. On calcareous earth, or on 
mosses over calcareous rocks. Examined from areas about Oxford, 
Cincinnati, Eaton, Fultonham, and Peebles. Not previously reported for 
Ohio, but collected by T. G. Lea near Cincinnati, in 1841. 
2. Collema tenax (Sw.) Ach. Lich. Suec. 128, 237. 1798. 
Lichen tenax Sw. Nov. Act. Soc. Sci. Ups. 4 : 249. 1784. 
Transforming the algal-host colony into a small to middle-sized, 
orbicular or more or less irregular body, which is 0.5 to 7 cm. across, 
65 to 85 mic. thick, and closely attached to the substratum, usually 
crenately lobed and imbricated, but sometimes depauperate and reduced 
to squamules when attached directly to rocks, with the upper surface 
olivaceous, varying toward black, with the lower surface scarcely lighter 
colored, and with the algal chains numerous and somewhat evenly dis¬ 
tributed ; thallus of densely disposed hyphae, which are often perpendicu¬ 
lar to the surfaces and are 2.5 to 4. mic. wide; rhizoids numerous at the 
points of attachment; apothecia common, small to middle-sized, sessile 
or adnate-immersed, 0.5 to 2 mm. in diameter; disk concave to slightly 
convex, red-brown and darker, surrounded by an entire or a crenate 
thalloid margin, which does not extend above it; exciple hyaline, of 
interwoven hyphae; hypothecium of interwoven hyphae, 80 to 95 mic. 
thick; hymenium 130 to 160 mic. thick; asci 65 to 75 mic. long and 16 
to 20 mic. wide; spores longitudinally 4- to 5-celled, transversely 2-celled, 
16 to 21 mic. long and 7 to 10 mic. wide. 
Collected near Paint, by Bruce Fink, No. 460. Usually on calcar¬ 
eous soil over rocks, often growing with mosses. Ours a depau])erate 
