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spermogones. Resemble S. rubria as to colour, but differs greatly
in other respects, and appears to be quite distinct from all described
species.
S. plicatilis, Tuck.mss: thallo crustaceo-subfoliaceo appresso gyroso-plicato ambitu lobato albescente;
apotheciis appressis Disco plano fusco-nigro nudo margine thallino tenui sub-
crenulato. Spore octonæ in thecis lato-clavatis incolores ex ovoideo-ellips-
oidéo dein oblongæ plus minus irregulares simples limbatae protoplasmate
denun guttulosa 1½–2 plo diametro longiores. Rocks. On cretaceous
Sandstone, Red Buttes, North Platte, in company with S. melanoph-
thalma, &c. Thallus closely approached to the rock, gyroso-plicate (as
in Lecidea Wahlenbergii) passing at the margin into short lobules;
from greenish-glaucenscent becoming white, the tips of the lobules often
blackening at the edge. Apothecia of middling size; appressed; the
naked, blackish-brown, flat disk bordered by a rather thin, at length
somewhat crenulate thalline margin. Spores colourless; ellipsoid;
simple. The specimens small and imperfect, but sufficient marked.
Placodium friabile (Vill.) Lichen, Vill. Dauph. 3, p. 979, t. 55. Parmelia, Schær. Spicil. p. 426;
& Lich. Helv. n. 339. Lecanora, Schær. Enum. p. 64. Lichen fulgens, Sw./Par-
melia, Ach. Fr. Lichenogr. p. 119; & Lich. Suec. n. 287. Lecanora, Ach. Syn.
p. 183. Moug. & Nestl. Cr. Vog. n. 1052. Placodium, Nyl. Prodr. Gall. p. 74;
Lich. Scand. p. 137. On the earth, in calcareous soil. Bad lands
of Judith, Nebraska; and at Deer Creek, North Platte; in fertile,
Hayden. Exactly agreeing with the European lichen, which was
observed in Greenland by J. Vahl. (St. Fr. Lich. Arct.) but has not,
till now, been detected elsewhere in North America.
var. bracteatun, Ach., thallo granuloso-conglobato. With a; and fertile at Deer Creek.