The Collemaceae of Ohio 
49 
numerous toward the surfaces and largely perpendicular, but in part 
horizontally or irregularly placed, 2 to 5 mic. wide; rhizoids seldom seen 
in the sections; apothecia minute to middle-sized, numerous but scattered, 
sessile, 0.2 to 1.5 mm. in diameter; disk brown or red-brown, flat or 
convex, surrounded by a thin, entire thalloid margin, which is sometimes 
overgrown; exciple of interwoven hyphae tinged with brown; hypothe- 
cium of interwoven hyphae, 40 to 85 mic. thick; hymenium 85 to 95 mic. 
thick; asci 60 to 85 mic. long and 12 to 20 mic. wide; spores long 
ellipsoid-pointed, 6-celled, 22 to 34 mic. long and 4 to 6 mic. wide. 
A single specimen was collected by W. A. Kellerman, in Delaware 
County. The specimen is sterile and without number. On tree 
trunks. The microscopic apothecial characters were taken mainly from 
Lichenes Boreali-Americani, No. 199. 
5. Synechoblastus flaccidus (Ach.) Trev. Caratt. Gen. Collem. 1853. 
Lichen haccidiis Ach. Vet. Akad. Handl. i6\ 14. 1795. 
Transforming the algal-host colony into a middle-sized, suborbi- 
cular or irregular foliose body, which is 3 to 7 cm. across, 40 tO' 185 mic. 
thick, and rather loosely attached to the substratum, with rather wide, 
rounded, entire, and often imbricated lobes, with the upper surface 
olivaceous, varying toward black or green, usually granulate, with the 
lower surface commonly lighter colored, and with the algal cells some¬ 
what more numerous toward the upper surface; thallus of densely dis¬ 
posed hyphae, which extend in various directions and are 2.5 to 4 mic. 
wide, those perpendicular to the surface of the thallus often passing at 
one end or at both ends into short, enlarged cells, or into branches, the 
end cells of which are short and wide and sometimes cohere laterally to 
form a true plectenchyma over limited areas; rhizoids rarely seen in the 
sections; apothecia rare, small to middle-sized, sessile, 0.5 to 1.5 mm. in 
diameter; disk concave to slightly convex, brown or red-brown, sur¬ 
rounded by an entire, often granulate thalloid margin, which may extend 
above it; exciple plectenchymatous, tinged with brown; hypothecium 
plectenchymatous below, of interwoven hyphse above, 34 to 88 mic. thick; 
hymenium 85 to 125 mic. thick; asci rather large, 80 to 110 mic. long 
and 14 to 21 mic. wide; spores long ellipsoid-pointed, 4- to 6-celled, 28 
to 40 mic. long and 5 to 9 mic. wide. See Figs. 6, 7, 8, 13, and 17. 
Widely distributed in the state. On trees and rarely on rocks. 
Examined from areas about Amanda, Eaton, Oxford, Peebles, Paint, and 
Orwell. 
