The Collemaceae of Ohio 
47 
Found on limestone rocks near Peebles, Adams County, usually 
growing with mosses. The plant was collected for Collcma pulposum^ 
but differs considerably in its effect on the appearance of the algal-host 
colony and much more in its anatomical characters. This new species 
resembles Synechoblastus pycnocarpus strongly, but it modifies the algal- 
host colony in a different manner and has several distinct features of 
thallus and fruit. The plant seems to resemble Synechoblastus texanus 
(Tuck.), both in its physiological action on the algal-host colony and in 
its anatomical characters. Three collections were made near Peebles. 
2. Synechoblastus pycnocarpus (Nyl.) Fink Cont. U. S. Nat. Herb. 
14 ^: 134. 1910. 
Collema pycnocarpum Nyl. Syn. Lich. i: 115. 1858. 
Transforming the algal-host colony into a rather small, suborbicular, 
foliose body, which is 1.5 to 6 cm. across and 150 to 875 mic. thick, the 
horizontal portions closely adnate and sometimes sparingly perforate, 
with the lobes long and more or less branched, rising toward the margin 
into a suberect position, the erect or ascending portions densely rugose 
lobulate and obscuring more or less the parts below, especially when 
covered with apothecia, with the upper surface olivaceous varying toward 
green or black, and sometimes granulate, with the lower surface lighter 
colored, and with the algal chains distinctly more numerous toward the 
surfaces; thallus of hyphse which are densely disposed toward the sur¬ 
faces but somewhat scattered toward the center, variously placed and in 
part perpendicular or horizontal, the latter especially toward the center, 
2 to 4 mic. wide; rhizoids seen in large numbers in certain sections of 
the thallus; apothecia small, numerous, sessile, marginal on erect or 
ascending lobules, 0.4 to 0.8 mm. in diameter; disk flat to convex, brown 
or red-brown, surrounded by an entire thalloid margin, which does not 
extend above the disk and is sometimes overgrown; exciple of interwoven 
hyphae, tinged with brown; hypothecium of interwoven hyphse, 33 to 85 
mic. thick; hymenium 55 to 85 mic. thick; paraphyses frequently and 
variously branched; asci 45 to 62 mic. long and 10 to 14 mic. wide; spores 
ovoid to ellipsoid-pointed, 2-celled, 11 to 20 mic. long and 3.5 to 6.5 mic. 
wide. See Figs. 9, 11, 18, and 24. 
Widely distributed in the state, but not common. On tree trunks. 
Examined from areas about Peebles, Springfield, Amanda, Cedar 
Swamp, Paint, Prospect, and Columbus. 
