144 COLLEMA. 



vex, and excluding the thin, entire margin. Spores ovoid-ellip- 

 soid, bilocular, decolorate, ^ inic. Nyl. Syn. p. 115. 



Trunks, North America, Nylander I. c. 1858. Canada, Drum- 

 mond, New England and Middle States, Tuckerman. Illinois, 

 Hall. Carolina and Georgia, Eavenel. Florida, Austin. Ala- 

 bama and Arkansas, Peters. And also in New Granada, S. 



Amer., Nylander (Lindig, herb. n. 2872). 



3(b). C. cyrtaspis, Tuckerm. ; a stouter and rather larger 

 lichen with more distinct lobation, better displaying the thalline 

 features of C. pycnocarpum ; apothecia larger (commonly 

 l-2 mm - wide) scattered, the dark-chestnut, shining disk bordered 

 more persistently by a thickish, crenulate margin. Spores sub- 

 fusiform, 4-locular, decolorate, ^ mic. Obs. Licli. 2, 1. c. 387. 



Trunks in Pennsylvania, Maryland, and Virginia, Tucker- 

 man 1. c. 1862. It has occurred also in New Jersey, Austin ; 

 New York, Sarticell ; and even in Massachusetts, Willey ; but 

 is better exhibited southward. Illinois, Hall. Ohio, Lea. North 

 Carolina, Curtis. South Carolina, and Georgia, Mavenel. Ala- 

 bama and Arkansas, Peters. There is scarcely any difference, 



in the thallus, from C. pycnocarpum, beyond what is noted. 

 Indeed C. aggregatum may be said to differ, in this respect, 

 rather in that inferior regularity of arrangement which Sommer- 

 felt has distinguished as ' caespitose-fasciculate,' than anything 

 else ; and the thallus of the very distinct C. callibotrys is not 

 easily otherwise describable ; all these lichens depending mainly 

 for their rank on the spore-characters. It may however be 

 added, for what it may be worth, that while the apothecia and 

 the spores of the present are larger than those of C. pycno- 

 carpum, the collogonidia appear to be somewhat- smaller ; or to 

 differ as 3-6 mic., from 4-7 mic. 



4. C. laciniatum, Nyl. ; thallus middling-tized, orbicular, 

 cartilagineous, stellate; olive-green; the narrow, elongated, 

 radiant lobes discrete, deeply laciniate, with rugose-nodulose 

 tips; apothecia of middling size, elevated; the flattish disk bor- 

 dered by a sub-crenate margin. Spores fusiform-ellipsoid, biloc- 

 ular, decolorate, ^ mic. Nyl. Syn. 1, p. 116. 



Calcareous rocks. Alabama (Peters], Tuckerman in Nyl. I. c. 

 1858. Kansas, Hall. 



5. C. micropliyllum, Ach. ; thallus minute, sub-membranace- 

 ous, orbicular, or now fragmentary and effuse ; olivaceous be- 



