148 COLLEMA. 



b. leucopepla, Tuckerm. ; a smaller lichen, with very small 

 apothecia which are white-pruinose ; and longer spores, ^ mic. 

 Gen. p. 92. 



Trunks, a, northern and middle States, not rare, Muhlen- 

 berg Catal. 1818. Canada, Macoun. Ohio, Lea. Illinois, Hall. 

 Maryland and Virginia, Tuckerman. South Carolina, Eavenel. 

 Florida, J. D. Smith. Alabama, Peters. Oregon, Hall. Cali- 

 fornia, Bolander. b, South Carolina and Georgia, Eavenel. 



Florida, J. D. Smith. Alabama, Peters. Louisiana, Hale. 



a occurs now white-pruinose ; in Massachusetts, Willey. 



11 (b). C. ryssoleum, Tuckerm. ; thallus membranaceous, rather 

 loose, smooth ; from olivaceous at length blackish-brown ; the 

 rounded, bullate lobes ascendant, with plicate-undulate and 

 crisped edges, above rugose-papulose, beneath paler and reticu- 

 late -lacunose; apothecia smallish to almost middling -sized, 

 scattered, or crowded ; otherwise as in the last. Spores ovoid 



and cymbiform, 4-6-locular, decolorate, ^J mic. Lich. Calif. 



p. 34 ; Gen. p. 92. 



Rocks. New England to Virginia, Tuckerman I. c. 1866. 

 Peaks of Otter, Va., Beyrich in herb. Spreng. New York, and 

 New Jersey, Austin ; Peck. Mountains of North Carolina, Cur- 

 tis; Buckley. Apothecia now small; and the lichen is with- 

 out doubt a member of C. nigrescens, but pretty well differenced ; 

 much as C. leptaleum from C. aggregatum. 



* * * Eucollema. Thallus foliaceous, coriaceous -cartila- 

 gineous, very gelatinous ; the cortical layer deficient. Spores for 

 the most part ovoid-ellipsoid', or now elongated; from bi-quadri- 

 locular with entire sporoblasts (rarely persistently entire] soon 

 passing into muriform, which last state especially characterizes 

 the section. 



12. C. pulposum (Bernh.) Nyl. ; thallus of middling size, 

 orbicular, coriaceous, very gelatinous when wet, more or less 

 rosulate; from leek-green blackening; the thick, entire, or 

 repand-crenate lobes explanate at the circumference, but irreg- 

 ularly imbricate and plicate at the centre, where they become 

 reduced and finally granulose ; apothecia of middling size, flat- 

 tish j the disk rufous, the margin rather entire. Spores ovoid- 

 ellipsoid, from 4-locular becoming sub-muriform, decolorate, 



JLi 



16-24 

 7-10 



m ic. Nyl. Syn. I, p. 109. Tuckerm. Gen. p. 93. 



