160 28. COLLEMACEAE [104. Collemodes 



and often minutely wrinkled, the hyphae often protruding in minute whitish areas 

 commonly along the margin; apothecia minute to small, 0.1-0.3 mm. across, nu- 

 merous, immersed, the disk concave to almost flat, brown, the algoid exciple rather 

 thick and prominent; hypothecium hyaline or tinged brownish; spores oblong to 

 ellipsoid-pointed, 3-4-septate transversely and 1 -septate longitudinally, 18-22 X 

 9-1 1 /a, irregularly arranged. 



On exposed limestone, near Big Rock, Fayette, Iowa. 



13. Collema glaucescens Hoffm., Deutschl. Fl. 2:100. 1795. 

 C. limosum Ach. 



Transforming the algal colony into a somewhat thin, usually small, scattered, 

 greenish to olivaceous, squamulose body, the large lobes crenate to serrate, nar- 

 row and ascending; apothecia small to middle-sized, 1-3 mm. across, immersed 

 in the algal host body or becoming superficial and often obscuring its body, the 

 disk concave to flat, becoming reddish brown, the algoid exciple thin, but finally 

 prominent, sometimes crenulate; hypothecium brownish; spores usually 3-7- 

 septate transversely and 1-3-septate longitudinally, 24-38 X 11-15 /x. 



On soil, from New York to South Carolina, and westward across the United 

 States. 



14. Collema granosum (Schreb.) Rabh., Deutsch. Krypt. Fl. 2:53. 1845. 

 Lichen granosus Schreb., Spic. Fl. Lips. 128. 1771. C . auriculatum Hoffm. 

 Transforming the algal colony into a rather large, rigid, irregularly wavy or 



cut-lobed, yellowish green to blackish, transversely or reticulately wrinkled or 

 granulose' body, with the lobes short and round to long and narrow; apothecia 

 middle-sized, 0.4-0.7 mm. across, rarely present, immersed to adnate, the disk 

 concave to flat, reddish brown, the algoid exciple thick and usually wrinkled or 

 granulose; hypothecium brownish; spores oblong-ellipsoid, 3-5-septate transversely 

 and 1-3-septate longitudinally, 23-26 X 10—13 //.. 

 Over mosses on rocks, Ohio and Illinois. 



OTHER SPECIES REPORTED 



Collema bermudiana Tuck. — Florida. 

 Collema stenophyllum Nyl. — North America. 



104. Collemodes Fink, Mycologia 10:236,237. 1918. 



Transforming the algal host colonies into foliose bodies; thallus wholly mycelial, 

 imbedded in the host and attached to the substratum by rhizoids; apothecia small 

 to large, adnate to sessile; paraphyses often branched toward the apices, spores 8, 

 hyaline, transversely and longitudinally septate; male reproductive organs internal 

 spermatia, occurring in groups without spermagonial covering; female organs as 

 in the Collemaceae generally, but the trichogynes passing to the groups of spermatia 

 instead of rising above the surface of the algal-host colony. 



The algal host is Nostoc. 



1. Collemodes Bachmanianum Fink, Mycologia 10:235-38. pi. 13, f. 1-6. 1918. 



Transforming the algal colony into a more or less irregular, closely attached, 

 olive-green, bluish or blackish body, the lobes becoming wavy-crenate and some- 

 times imbricated, the marginal ones often ascending to suberect, the central ones 

 usually flat; apothecia middle-sized to large, 0.5-4.5 mm. across, adnate to sessile, 

 scattered or thickly disposed, the disk concave or rarely flat, reddish brown, the 

 algoid exciple prominent, becoming wrinkled-crenate; spores ovoid-ellipsoid, 3-5- 

 septate transversely and 1-3-septate longitudinally, 17-28 X 7.5-12 /x. 



On soil and mossy rocks, New York, Ohio, Wisconsin, Iowa, Minnesota, and 

 Missouri, scarcely distinguishable from Collema pulposum (Bernh.) Ach., except 

 with respect to the very different sex organs and sexual behavior. The strong 

 resemblance would lead one to suspect that the plants might be the same and bear 

 both kinds of sex organs. However, careful study showed nothing of this kind. 



