The Collemaceae of Ohio 
59 
the base and tinged with brown toward the more or less enlarged apex; 
asci usually clavate; spores hyaline, becoming muriform. 
Thallus somewhat thicker than in Lcptogiiiin and rigid enough to 
overcome largely the tendency of the algal-host colony to gelatinize con¬ 
spicuously when moist. 
1. Mallotium saturninum (Dicks.) Mass. ]\Iem. Lich. 95. pi. 18. f. 114. 
1853. 
Lichen saturniniis Dicks. PL Crypt. Brit, i*.' 21. pi. 6. f. 8. 1790. 
Transforming the algal-host colony into a rather large, suborbicular 
or irregular body, which is 4 to 15 cm. in diameter, 80 to 250 mic. thick, 
and somewhat ascending, rounded, subentire, or undulate, with the upper 
surface lead-colored varying toward olivaceous or black, more or less 
granulate and sometimes rugose, and the lower surface clothed with light- 
colored rhizoids, which form a delicate nap, and with the algal chains 
more numerous toward the upper surface of the colony; medulla of 
somewhat densely and uniformly disposed hyphae, which are 2.5 to 5 
mic. in diameter, in part irregularly arranged, but many of them roughly 
perpendicular while others toward the center of the thallus tend toward a 
horizontal position; cortex not always well developed and distinct, cells 
of the upper cortex 5 to 8 mic. long and 4.5 to 5 mic. wide, those of the 
lower cortex slightly smaller; apothecia rare, middle-sized, subsessile, 1 
to 2 mm. in diameter, the disk flat and red-brown, surrounded by a more 
or less granulate and irregular thalloid margin ; spores ellipsoid, becom¬ 
ing muriform, 23 to 30 mic. long and 7 to 9 mic. wide. 
Known to us from Ohio only through No. 572, E. E. Bogue, col¬ 
lected near Columbus. Some of the specimens distributed under this 
number are in part or wholly Syneclioblastus flaccid us. The only speci¬ 
men seen was sterile, and the apothecial characters are taken from Tucker- 
man. We have never seen any American specimens in fruit. On tree 
trunks, and rarely on rocks. 
Descriptions of Sex Organs. 
Ascogonia coiled, hyaline, single or in groups; trichogynes usually 
passing directly or indirectly to and above the surface, one from each 
ascogonium; spermagonia marginal or submarginal; basidia of short 
cells, more or less branched; spermatia hyaline, one-celled, oblong-con¬ 
stricted, located on the ends and sides of the basidia. Internal male sex 
organs present in an Ohio species not yet named. 
