COLLEMA. 153 



colorate, ^ mic. Nyl. Syn. 1, p. 107. C. furvum pro p., & 



C. tunceforme, Ach. Syn. p. 322. 



Calcareous rocks. Pennsylvania (Mulileriberg in herb. Willd. ), 

 Tuckerm. Syn. N. E. 1848. Found by Mr. Russell in Vermont; 

 and by myself in Canada, New York, and Maryland, but only 

 twice observed fertile. It is similar to C. flaccidum, but has a 

 thicker thallus, and is quite distinct in the spores. 



17. C. granosum (Wulf.) Schser.; thallus of middling size, 

 coriaceous-membranaceous, rigid, very gelatinous when wet, 

 irregularly laciniate, dirty-yellowish-green (lead-coloured and 

 blackening); the divisions sinuously lobed, imbricate; either 

 ample and rounded, with entire or crenate-cut edges ; or elon- 

 gated and variously divided ; transversely or reticulately sharp- 

 wrinkled ; and more or less coarsely granulate ; [apothecia, in 

 European specimens, scattered, of middling size, innate or ses- 

 sile ; the disk dark-red, the margin thick, and wrinkled or gran- 

 ulate. Spores ellipsoid and cymbiform, soon sub-muriform (the 



transverse series of spore-cells 4-6), decolorate, ^^ mic.] 



Schcer. Spicil. p. 540; Enum. p. 253. C. auriculatum, Hoffm. 



D. Fl. C. dermatinum, Ach. L. U. p. 648. 



Calcareous districts, growing over mosses, on rocks. Ohio 

 (Lesquereux), Tuckerman Gen. 1872. Illinois, Hall Agree- 

 ing not ill with the last, but the ultimate lobation is different, 

 as well as the coloration, and especially the minute wrinkling. 

 Fruit rare ; seen only, in our plant, very young. 



18. C. pustulatum, Ach.; thallus almost middling - sized, 

 coriaceous-membranaceous, sub-monophyllous; brownish-olive; 

 with rounded, lobate-crenate periphery ; becoming lacero-lacin- 

 iate, and often convolute and sinuately many- cleft ; besprinkled 

 with the pustular fruit; apothecia minute, crowded, adnate; 

 the concave or flattish, dark-red disk scarcely exceeded by the 

 entire border. Spores rounded-ovoid and ellipsoid, from bilocu- 

 lar becoming quadrilocular and sub-muriform, decolorate, ^^ 

 mic. Ach. Syn. p. 317. Nyl. Syn. 1, p. 108. 



Calcareous rocks. Pennsylvania (Muhlenberg), Acharius Syn. 

 1814. Alabama, Peters. Illinois, Wolf. Comparable as re- 

 spects the lobation with the last, but very different, especially 

 in the fruit, which neither Acharius nor Nylander have well 

 described from the lecanorine point of view. C. stenophyllum, 



