( 220 ) 
tributed, some years since, almost the whole of the North American 
Arthoni@ known to him, to the learned monographer of the group; and 
is now able therefore to cite his determinations, in the list subjoined, of 
by far the larger part. 
North American species with pale (not black) fruit. 
4. cinnabarrina (DC.) Wallr. (Coniocarpon, Fr. L. E. p. 379. Conio- 
loma coccineum, Eschw. Bras. p. 170). On various barks, western New 
York (Mr. Willey). South Carolina (Mr. Ravenel). Alabama (Mr. Beau- 
mont). Louisiana (Hale). Texas (Mr. Ravenel). This fine species 
varies greatly in the colours, as shewn especially, in our plants, by Mr. 
Ravenel’s specimens from Texas. One set of these, differing in its brown, 
often white-pruinose, or at least white-edged clusters, without a trace of 
the characteristical colour to which the species owes its name, is further 
marked by elongated, clavate thekes, and rather smaller spores (0,015— 
23™™- long, and 0,005-7™™- wide) but I observe such thekes in European 
specimens of A. cinnabarrina ; and they occur as well in the near akin 
but much smaller lichen next to be set down. ——A. chiodectella, Nyl. in 
Flora, 1869, p.125. On Bald Cypress (Yaxodium) Louisiana (Hale). 
Thekes from pyriform at length clavate. Spores 0,017-23™™- long, and 
0,007-8"™"- wide. A plant from Texas (Mr. Ravenel) probably referable 
here, offers rather smaller spores. ——A. pyrrhula, Nyl. (A. medus@a, 
Tuckerm. 77 litt.). Trunks, frequent in New England, and I have observed 
it in Virginia. North Carolina (Rev. Dr. Curtis).—A. rubella (Fée) 
Nyl. (Graphis, Fée). On various barks, at the South. South Carolina 
(Mr. Ravenel). Alabama (Mr. Beaumont). Louisiana (Hale). Texas 
(Mr. Wright). As respects our other species sufficiently distinguishable, 
but its relations with the older A. caribea (Ach.) Nyl., are perhaps less 
clear. Both are Ustalie of authors. A. conturbata, Nyl. (Prodr. Fl. 
iV. Gran. p. 98, ”.). On bark, Tampico, Mexico, Nyl. 1. c. ——A. platy- 
Spilea, Nyl. (1. ec. p. 99, n.). On Mangrove, Tampico, Mexico, Nyl. 1. ¢.— 
1. leucastrea, Tuckerm.! Trunks, Texas (Mr. Wright). A.impolita 
(Ehrh.) Borr. (Parmelia, Ach. Meth. Fr. L. E. Arth. pruinosa, Ach. L. U. 
Nyl.). Bark of Oaks, California (Mr. Bolander). Enumerated by Muhlen- 
berg in his list of North American lichens, but is unknown in the Atlantic 
1 Arthonia leucastrea (sp. nova) thallo effuso farinoso lacteo; apotheciis 
innatis oblongis elongatisque planis rufo-fuscis albo-pruinosis in pscudo-stroma 
radiato-stellatum demum confluentibus. Hypothecium fuscescens. Spore in thecis 
pyriformibus 6-8ne, ovoidee, quadriloculares, loculis extremis amplioribus, mediis 
subinde divisis, incolores, longit. 0,012-16™™., crassit. 0,005-7™™-, The hymenial 
gelatine finally reddens with iodine. Distinct from 4. polygramma, Nyl. (in 
Prodr. Fl. N. Gran. p. 99, & in Herb. Lindig n. 817) which has smaller, darker, 
more irregular fruit, and oblong-ovoid spores, with entire spore-cells. The spores 
of A. impolita are similarly diverse, as is also the whole habit; unless indeed in 
the remarkable form called by Nylander v. medusula (Lich. Par. n. 84). 
