river, Hayden. Fruit detected in the mountains of Santa Fe, New Mexi- co, by Mr. Fendler. Scales very small; from roundish becoming oblong; appressed, but the edge free and often a little elevated; crenate; or at length a little elongated and lobate; from pale-brownish (with a greenish tinge when wet) becoming chestnut-brown; rarely much reduced or glebulose. Apothecia small; adnate; becoming a little elevated; convex and apparently emarginate from the first; finally subglobose; from blackish-rufous at length black. Spores in eight, colourless, from ovoid becoming oblong-ovoid, and twice and a half as long as wide; the pro- toplasm separating commonly into two or more roundish-irregular por- tions; as commonly in L. lurida. In the present group (Psora, Meyen.) scarcely any distinguishing character are derivable from the spores, but those of the lichen here described agree rather with the spores of L. lurida in the variability of the sporoblast, and Koerber takes this feature into the character of the last-named species. The plant is much smaller in all its parts than either L. lurida or L. globifera, but agrees with the former in its dull, never ferruginous colour, and more appressed scales, and with the latter in its sub-globose, emarginate apothecia. L. (Psora) decipiens (Ehrh.) Ach. Metz. p. 80; Syn. p. 52. Nyl. Lich. Scand. p. 214. Psora, Hofm. Pl. Lich. 3, p. 62, t. 43, f. 1-3. Koerb. Syst. p. 177. Lecanora, Ach. Lichenogr. p. 409. Biatora, Fr. Lichenogr. p. 252; & Lich. Suec. p. 402. Tul. Mem. Lich. p. 175, t. 10, f. 28-31. On the earth, in calcareous soils. Bad lands of Judith, Nebraska, Hayden. Deer Creek, North Platte, Hayden. The lichen was known to Hofmann, a North American (probably sent by Muhlenberg) in 1796, and is in Muhlenberg's Catalogue; and it was found by Sir John Richardson in Arctic America (Hook. Append. To Frankl. Narr. p. 758) but the only specimen found in the United States