PERTUSARIA. | LECANO-LECIDEEI. 505 
saffron-red, CaCl—). Apothecia rugoso-difform, innate in non- 
prominent thalline areole, brownish-black, internally subincolorous ; 
spores 2uee (rarely 3-4ne), olive-blackish (K+ violet), 0,090-130 
mm. long, 0,055-85 mm. thick.—Cromb. Grevillea, xix. p. 59.— 
P. spilomanthodes Nyl. Flora, 1881, p. 179; Cromb. Grevillea, x. 
p. 23.— Brit. Exs.: Mudd, n. 260. : 
With the following well characterized by the blackish spores, though 
Mudd erroneously describes them (in their immature state) as pale- 
yellowish-green or pale-yellow. Itcomes very near P. spilomantha Kyl, 
a plant of the Eastern Pyrenees, but differs in the normally 2-spored 
thecee and the smaller spores. The apothecia are rather scattered in the 
Specimens seen. ‘ 
Hab. On rocks and walls in upland districts—Distr. Only sparingly 
in a few localities of N. England.—B.M.: Ayton Moor, Cleveland, 
Yorkshire ; Ennerdale, Cumberland. 
21. P. urceolaria Nyl. Bull. Soc. Linn. Normand. vi. (1873) 
p. 324 (nota).—Thallus effuse, thin, areolato-rimose, subpapilloso- 
scabrid, greyish- or yellowish-white (K+ yellow, then orange-red, 
CaCl—). Apothecia small, depressed, urceolariiform, black; spores 
1—4ne, blackish (K+ violet), 0,100-140 mm. long, 0,050-75 mm 
thick.—Cromb. Grevillea, xix. p. 59; Leight. Lich. Fl. ed. 3, p. 238 
pro parte. 
An endemic plant easily recognized by the urceolato-depressed apo- 
thecia. It is allied to the preceding species, but differs in the thallus 
being more or less rough with papillz and in the form of the fruit. The 
two specimens seen are well fertile. 
Hab, On granitic stones of a wall in a maritime district.—Distr. Ex- 
tremely local in one of the Channel Islands.—B. M.: La Moye, Island of 
Jersey. 
C. Thece pluri-spored; spores colourless. 
a. Spores 8ne. 
22, P. Wulfenii DC. Fl. Fr. ii. (1805) p. 320.—Thallus deter- 
minate or subeffuse, membranaceo-cartilaginous, thickish, plicato- 
rugose, rimose, whitish- or greyish-yellow (Kf+ yellowish, K(CaCl) 
-+orange-yellow); fertile verruce crowded, irregularly depresso- 
globose or difform. Apothecia with the ostiola dilated, confluent, 
difform, sublecanoroid, blackish, undulate and subcrenate at the 
margin (epithecium K+-violet); spores 0,058-85 mm, long, 0,028- 
38 mm. thick.—Cromb. Grevillea, xix. p. 59.—P. fallaw (Ach.) 
Sm. Eng. Fl. v. p. 160; Leight. Br. Angio. Lich. p. 29, t. 10. 
f. 2; Mudd, Man. p. 276; Cromb. Lich. Brit. p. 60; Leight. 
Lich. Fl. p. 240, ed. 3, p. 231. Lichen hymenius, Eng. Bot. 
t. 1731. Thelotrema hymenium Turn. & Borr. Lich. Br. p. 185. 
Porina hymenea Gray, Nat. Arr. i. p. 495. Porina fallax Tayl. in 
Mack. Fl. Hib. ii. p. 102. Lichenoides verrucosum et rugosum, cine- 
reum, glabrum Dill. Musc. 128, t. 18. f. 9 pro parte.—Brit. Kus. : 
Mudd, n. 266; Leight. n. 71. 
