8. P. hypotropoidss Nyl. in litt.— riiallus expanded, mem¬ 
branaceous, glaucescent, the rounded lobes depressed, more or less 
crenate, and finally elongated into narrow tlay'^laciui;e, beneath 
black and naked, but yellowish-white at the margin. Me. K red, 
but not showing any reaction beneath. Apothecia large, perforate. 
Spores .009-.16x.006-.009"'"'.— 
9. P. tiliacea Ach.—The reaction given is Me. CaCl red, as 
in Lojka lilxsic. Univ. n. 62. But only one of numerous N. B. spec¬ 
imens gives any reaction, which would be P. subloivigata Xyl., Me. 
K. yellow, then red.—P. livida 'rayl. from New Orleans is considered 
by Nylander as a variety of this; but .Miiller in Beitr. n. 1344 looks 
upon it as distinct. P. galbina Ach. Syu. 195, from North America 
is a small form on dead wood. P. relicina Fr., which is made a varety 
of this by Tuckermau, is considered by most authors to be distinct. 
10. P. Borreri, var. rudecta Tuck, is separated by Nylander 
on account of the spermatia, which in Borreri are sublageuiform 
and in rudecta acicular-cylindrical and twice as long. 
11. P. Kamtschadalis (Ach.) Eschw. Me. K red.— '■^Borrera 
glabrata Schwein.” then ‘•'‘Evernia polita Tuck.” in herb. Schwein., 
(comm. Eckfeldt without station) seems to be a broad-lobed form 
of this. 
12. P. conspersa (Ehrh.) Ach.—Me. K yellow then red. But 
isidiose specimeus on rocks. New Bedford, give Me. K—. as is also 
the case with a similar specimen in Stenh. Exs. Suec. n. 122., while 
the others give K red. 
13. P. molliuscula Ach.— Me. K yellow then red. Mr. T. 
A. Williams has described and figured in report of Missouri Bot. 
Garden, May 1892, a fertile specimen collected in the Black Hills 
by Dr. Eugelmanu in 1856. A fertile plant, collected by T. S. 
Brandegee in Color.ado, closely resembles Mr. Williams’ figure and 
description. Apothecia numerous, the margin incurved, crenate, 
the disk blackening. Spores .011-.013x.005-.006'""'. Spermatia cyl¬ 
indrical, .007-.009""" long. Me. K red. 
14. P. congruens Ach.—This species, which is figured in 
Swartz, Lichenes Americani, pi. 4, was not recognized by Tucker¬ 
mau as North American. But accoiding to Nylander it occurs in 
Mexico, and Muller, who had seen Mulilenberg’^oi’iginal specimen 
in herb. Swartz says in Lich. Argent. 64 that he cannot distinguish 
from it his P. versicolor Beitr. n. 315, from New Holland, and refers 
Krempelhuber’s plant to a distinct species, P. subcongruens. 
15. P. isidiocera Nyl. Syn. l: 381.— This occurs in arctic 
America. “Aflinis P. aurulentae.'’'’ 
16. p. sphgerosporella 31uller Beitr. ?i. 76*50.—Thallus ap- 
pressed, ochroleucous, rugose beneath, pale yidlowish, and with 
pale fibrils. Apothecia at length plane, the disk from tlesh-colorcd 
becoming livid-fuscous. Spores globose, diam. .005-.007'""'.—On 
trees, (,’regon. Dr. Eyall, in herb. Kew. 
