204 The Botanical Gazette. (April, 
it has the lobation, but much larger spores, while it agrees 
with tiliacea in its closely appressed habit. The plants called 
cetrata.in lists of North American lichens must be considered 
as doubtful. 
4. P. TINCTORUM Despr., Nyl. Pyr. Or. 16.—This plant, 
according to Wainio, Brazil, has received various names and 
is P. perlata var. coralloidea Mey. & Flot., P. praetervisa Mil- 
ler and P. perlata var. platyloba ibid: to which he unneces- 
sarily adds another, P. coralloidea. A specimen from Jamaica 
(Rev. F. Wolle) determined by Nylander has the thallus pro- 
longed into convolute lobes; and a specimen from the west 
coast, H. A. Green, resembles var. platyloba. All the speci- 
mens give the same reaction Me. CaCl red. 
5. P. SACCATILOBA Tayl. Nyl. Flora —: 608. 1885. Pyt. 
Or. 40. (P. latissima Kph.; P. Zollingeri Hepp.)—Me. K 
yellow, CaCl light red. Spores large, nearly as in P. /atissims 
€.—Mexico. P. glaberrima Kph. is P. latissima Fee. ; 
6. P. COMPARATA Nyl. Flora—:290. 1869 where it is said 
to be perhaps a var. of perlata analogous to cetrata, with the 
aspect of laevigata, is said in Hue Exot. to be widely dis 
tributed in North America. Me. K yellow. 
- SUBMARGINALIS Mich. Nyl. Flora —: 607. 18855 
(P. perlata Mont. Cub. 230; P. perforata var. cetrata ile 
Beitr. x. 69; P. perlata var. ciliata ibid. n. 16 ). “Similar 
to P. perlata, but the margin of the thallus ciliate and oftes 
partly laciniate, or laciniose-fimbriate. | Apothecia larger 
often perforate. Spores -O14-018 x .008-.012™".” Nyl. | 4 
Me. In a New Bedford specimen the thallus is divide 
into long, narrow, convex laciniz, which are black 2% 
P. subrugata in Willey: Lichens of New Bedford, but the ie 
longed lobes are broader.—In P. perlata the spermatia # 
005" 
-O10"™™ lon 
-O16™ lon 
8. P. HYPOTROPA Nyl.—This species is distinguished bY eo 
white borders of the under side of the thallus, which are XK 
ored yellow then red by K. Reaction as in P. perforata, Me. 
yellow, then red. od, 
9. FP. HYPOTROPOIDES Nyl. in litt. —Thallus expand 
membranaceous, glaucescent, the rounded lobes depres 
more or less crenate, and finally elongated into narrow 
