00 
mm. 
next following; to which, indeed, it is as close, as it is well-marked 
ih its differences from it. 
Lecidea Pringlei, sp. «^z/.— Thallus pulvinate (reaching, in the 
specimens, about half an inch in height), composed of crowded, 
branched trunks, which are dilated above and densely plicate-rugose, 
and pass at the base into root-like branchlets, from pale to dark 
green, and finally black and shining; apothecia ample to very large 
(2-6 mm. in width), a little elevated, flat, soon wavy and lobed, and 
at length variously irregular, the disk from rufous-fuscescent very 
black, excluding the demiss, at first pale, but soon black and shining, 
stout margin, the hypothecium colorless. Spores from broad- soon 
oblong-ellipsoid, simple and pseudo-bilocular, 0,010-12°™- long, 
and o,oo3-5™«' wide. Spermatia filiform, now bowed, 0,018-24 
long. Paraphyses conglutinate. 
Rocks, Sierra Nevada, California, C. G. Pringle, in herb. Sprague. 
On the eastern slope of the Cascade Mountains, Washington Terri- 
tory, Brandegee, in the same herbarium. The lichen last-named is 
strikingly differenced from that of the Sierra Nevada by the extension 
of the trunks upward into slender, naked stems, only at the summits 
expanding into the plicate state, with something of the habit and at 
length colorof Alectoria ochroleuca, f. nigricans. The hypothecium 
in this species, as in L. Brande.gei, rests on the gonimous layer, and 
the feature is much more pronounced and constant here than it seems 
to be in Lecidea conglomerata of Europe. But I take the latter (in 
which also the apothecium is originally lecanorine, though ultimately 
quite lecideine) to be the key to the position of both these better 
developed American lichens. 
AcoLiuM Sti. Jacobi, sp. ?w.— Thallus of white granules soon 
. compacted mto a chinky crust ; apothecia of middling size in this 
genus/in the solitary specimen o"™- ,5-8 in width, and about the 
same in height), of the substance and color of the thallus, more or 
less turbinate, the interior exciple yellow, the disk more or less pro- 
truded, back, but yellowish-green at the surface. ' Scores (no thekes 
observed; rounded and short-ellipsoid, bi-locular, o;o2o-4o-- long, 
0,016-30™™- wide. * ' ' t 5> 
On the earth in " mesas," San Diego, California, C. G. Pringle, in 
herb, bprague. *= ' 
PYRENOTHAMNIA, Genus nov. 
Apothecia immersed in the thallus, the perithecium fuscescent, 
the amphithecium colorless, the paraphyses diffluent and obsolete. 
Spores m saccate-clavate thekes, ellipsoid, solitary, or in twos, or 
in fours, 0,030-56-- long, and o,oi6-24»- wide. Hymenogonia 
oblong, guttated, 0,010-24"""- long, and 0,003-4"™- wide Thal- 
lus fruticulose, cajspitose (about half an inch high, the width of the 
w'dT.rr' ''" Ji^^-s^ o.°°-3-), fragile, from a teretish 
bast dilated above, and dichotomously much-branched, the obtuse 
tips crenate-dentate ; the color from cinerascent fuscescent Hvoh^ 
forming a confused layer; the thalline gonidia 0,006-0012™™ 
diameter. 
m 
P. SPRAGUEI.-On the earth, "growing in masses on the eastern 
