OF ARTS AND SCIENCES. 273 



Sect. II. Apothecia sessile ; without crust ; parasitical. 



13. C. turhinatu7n, Pars. Parasitical ; exciple from globose becom- 

 ing turbinate, sessile, free, shining-black, the disk impressed, with a 

 thickish, in flexed margin. Fr. Lichenogr. p. 402. C. sessile, DC. 

 Turn. ^ Borr. Lick Brit. p. 128. Icon, E. Bot. t. 2520. 



On the crust, and in the verrucse of Pertusaria pertusa, Ach. New 

 England. New York, Torrey. Pennsylvania, Muhl. 



XXII. CONIOCYBE, Fr. 



Apothecia stipitate, spherical, suberose, without margin, bursting at 

 the apex and becoming at length entirely pulverulent, and concealing 

 the proper exciple. Thallus crustaceous. 



C. nigricans, Fr. Crust very thin, leprous, white ; stipes naked, 

 from whitish becoming black ; apothecia globose, naked, black. Fr. 

 Lichenogr. p. 384. 



Rough bark of hemlock and rock-maple ; New England. It is with 

 hesitation that I refer our plant to the European species, though it ap- 

 pears to agree with a specimen from Flotow. The genus is at once 

 distinguishable from the other genera of the tribe, and several other 

 species, as C. furfuracea, with yellow-pulverulent apothecia, and C. 

 pallida, with pale, white-pruinose apothecia, not improbably occur 

 with us. 



Div. II. ANGIOCARPI, Schrad., Fr. 



Tribe I. SPH^ROPHORACE^, Fr. 



XXIII. SPHiEROPHORON, Pers. 



Apothecia terminal, spherical, the thalline exciple at first closed, be- 

 coming at length lacerate-dehiscent. Nucleus globose, within cottony- 

 cartilagineous, without powdery with naked, black sporidia. Thallus 

 vertical, fruticulose, crustaceous-cartilagineous without, solid within. 



1. S. compressum, Ach. Thallus fruticulose, whitish, irregularly 

 branched, compressed, fibrillose-ramulose ; apothecia globose-depressed, 



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