PERTtJSATUA.] LECANO-LECIDEEI. 505 



saffron-red, CaCl ). Apothecia rugoso-difform, innate in non- 

 prominent thalline areolse, brownish-black, internally subincolorous ; 

 spores 2ua3 (rarely 3-4n), 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. Ea-s. : 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. It comes very near P. spilomantha Kyi., 

 a plant of the Eastern Pyrenees, but differs in the normally 2-spored 

 theca3 and the smaller spores. The apothecia are rather scattered in the 

 specimens seen. 



Hob. 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. nrceolaria Hyl. Bull. Soc. Linn. Normand. vi. (1873) 

 p. 324 (nota). Thallus effuse, thin, areolato-rimose, subpapilloso- 

 scabrid, greyish- or yellowish- white (K-f yellow, then orange-red, 

 CaCl ). Apothecia small, depressed, urceolariiform, black ; spores 

 l-4nse, 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 papilla? 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. Thecae pluri-spored ; spores colourless, 

 a. Spores 8nae. 



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 verrucse 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. fattax (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. Muse. 128, t. 18. f. 9 pro parte. Brit. Exs. : 

 Mudd, n. 266 ; Leight. n. 71. 



