105. Leptogium] 28. COLLEMACEAE 163 



On soil and old wood among mosses, from New England to New Jersey, and 

 westward to California and Oregon. 



4. Leptogium dactylinum Tuck., in Nyl., Syn. Lich. 1:123. 1858. 

 Transforming the algal colony into a small, much-lobed, lead-colored to black 



body, with round lobules ascending or erect, the margins entire to crenate, or 

 curled, and often beset above with coralloid branchlets, or the whole structure 

 finally passing into a broken-areolate, granulose crust; apothecia small, 0.4-0.8 

 mm. across, subsessile, the disk fiat, reddish brown, the proper exciple thin, lighter 

 brown, soon disappearing; hypothecium hyaline or tinged with brown; spores 

 ovoid-ellipsoid, 3-septate transversely and becoming 1-septate longitudinally, 16- 

 24 X 7-10 /*. 



On various rocks, from Vermont to New Jersey, and westward to Nebraska 

 and South Dakota. 



5. Leptogium Schraderi (Bernh.) Nyl., Act. Soc. Linn. Bord. 21:272. 1856. 



Lichen Schraderi Bernh., Journ. Bot. 1:22. pi. 2, f. 5. 1799. Collemodium 

 Schraderi (Bernh.) Nyl. 



Transforming the algal colony into a very small, minutely subcylindrical, 

 dichotomously or irregularly lobed, lead-colored to blackish, crustlike, often as- 

 cending body; apothecia minute to small, 0.2-0.5 mm. across, sessile, the disk 

 somewhat concave to slightly convex, brownish to brown, the algoid exciple thin, 

 soon disappearing, colored like the disk; hypothecium hyaline; spores ellipsoid 

 to ellipsoid-pointed, 3-5-septate transversely and 1-2-septate longitudinally, 22- 

 30 X 7-11 p. 



On rocks, southern California. 



6. Leptogium minutissimum (Floerke) E. Fries, Sum. Veg. 122. 1846. 



Collema minutissimum Floerke, Deutsch. Lich. part 5. 99. 1815. 



Transforming the algal colony into a minutely lobed, lead-colored to dark brown 

 or brownish body, the lobes or branches slender, elongated, crenate, finally crowded 

 and imbricated; apothecia small to nearly middle-sized, 0.3-0.8 mm. across, sessile, 

 the disk flat to slightly convex, reddish brown, the algoid exciple thin, pale; 

 hypothecium hyaline to cloudy; spores ovoid-ellipsoid, 3-7-septate transversely and 

 1-2-septate longitudinally, 18-29 X 8-12 /*. 



On soil among mosses, Massachusetts, Illinois, Washington, and California. 



7. Leptogium rhyparodes Nyl., Flora 48:210. 1865. 



Transforming the algal colony into a thin, brown to blackening, coarsely and 

 unequally granulose, apparently crustose, scaly, or often minutely branched and 

 sometimes ascending body; apothecia minute to small, 0.2-0.4 mm. across, sub- 

 sessile, the disk concave to flat, dull brown or blackening, the algoid exciple 

 elevated, lighter than the disk, finally disappearing; hypothecium pale yellowish; 

 spores ellipsoid or ovoid-ellipsoid, 5-6-septate transversely and becoming 1-septate 

 longitudinally, 22-34 X 10-15 fx. 



On mosses and rocks, California. 



8. Leptogium caesiellum Tuck., Syn. N. A. Lich. 1:156. 1882. 

 Transforming the algal colony into a flat, closely adnate, granulose, greenish 



gray to darker body, more or less covered with minute, scurfy, crenulate and sub- 

 imbricate squamules; apothecia small to middle-sized, 0.5-0.8 mm. across, adnate, 

 the disk slightly concave to flat, reddish brown, the proper exciple thin, lighter 

 than the disk; hypothecium hyaline to cloudy; spores ovoid-ellipsoid, 3-7-septate 

 transversely and 1-septate longitudinally, 18-34 X 8-14 /x. 

 On moist clay, Illinois. 



9. Leptogium perminutum Fink; Hedrick, Mycologia 26:154. 1934. 

 Transforming the algal colony into a small, thin, wrinkled and irregular, closely 



adnate black body, more or less covered with minute coralloid branchlets, the cor- 



