PERTUSAKIA.] LECANO-LECIDEEI. 507 



Yar. y. rupicola Nyl. Flora, 1873, p. 71. Thallus effuse, thickish, 

 areolato-verrucose, sulphur- or greenish-yellow colour ; fertile ver- 

 rucae crowded, difform. Apothecia with the ostioles punctiform, 

 blackish, depressed. Cromb. Grevillea, xix. p. 59. Pertusaria 

 fallax var. j3. sulphured Mudd, Mann. p. 276 ; Leight. Lich. Fl. 

 ed. 3, p. 231. Pertusaria sulplmrea var. (3. rupicola Schaer. Enum. 

 (1850) p. 229. 



Differs in the deeper colour of the thallus and in the habitat. In this 

 country it is very rarely fertite. The thallus is occasionally sprinkled 

 with small sorediose (abortive) verrucse, when it is Endocarjxm sulphu- 

 reum Tayl. in Mack. Fl. Hib. ii. p. 100, approaching subspecies P.jiam- 

 cans Lamy, Bull. Soc. Bot. t. xxv. p. 427. 



Hab. On rocks in maritime and mountainous regions. Distr. Only a 

 few localities in W. and N. England, the S.W. Highlands of Scotland, 

 and W. Ireland. B. M. : Dolgelly, Merionethshire ; Snowdon, Carnar- 

 vonshire ; Island of Anglesea ; Ingleby Park, Cleveland, Yorkshire. 

 Island of Lismore, Argyleshire ; The Trossachs, Perthshire. Dunkerron, 

 co. Kerry; Dawros River, Connemara, co. Galway. 



23. P. lutescens Lamy, Bull. Soc. Bot. t. xxv. (1878) p. 427. 

 Thallus subeffuse, thin, pulverulent, yellow, at times thinly zonate 

 at the circumferance ; sterile verrucae transformed into concolorous 

 soredia (K (CaCl) -j- orange-yellow). Apothecia very rare, lecano- 

 roid, dilated, blackish, the margin tumid ; spores 0,054-79 mm. 

 long, 0,028-40 mm. thick. Cromb. Grevillea, xix . p. 59. Isidium 

 lutescens Turn. & Borr. Lich. Br. p. 87 ; Sm. Eng. Fl. v. p. 230. 

 Lepraria lutescens Eng. Bot. t. 1529. Lepra lutescens Hoffm. PI. 

 Lich. (1784) t. 23. ff. 1, 2. Pertusaria fallax var. y. variolosa Fr., 

 Mudd, Man. p. 276. 



Has quite a leprarioid appearance when sterile, as it always is in this 

 country. By Th. M. Fries, who first described the fructification (Lich. 

 Scand. p. 312) it is regarded as only a variety of the preceding. From 

 this, however, it scarcely descends, while it differs in the much shorter 

 spores. The apothecia have as yet been found only in Sweden. 



Hab. On the trunks of old trees, chiefly oaks, in wooded upland 

 situations. Distr. Seen from only a few localities in S., W., and N. 

 England ; probably often overlooked. B. M. : Ickworth Park, Suffolk ; 

 Epping Forest, Essex ; Ockham, Surrey ; Hnrstpierpoint, Sussex ; New 

 Forest, Hants j Oswestry, Shropshire ; 'near Battersby, Cleveland, York- 

 shire. 



24. P. carneopallida Anzi, Nyl. Flora, 1868, p. 478. Thallus 

 hypophlaeodal, macular, pale or pale-glaucous (K , CaCl ). Apo- 

 thecia erumpent, minute, pseudo-lecanorine, at first plane with a 

 thin, irregular, white, spurious margin, then pulvinato-convex, 

 immarginate: spores 8me, 0,018-32 mm. long, 0,011-20 mm. 

 thick. Cromb. Grevillea, xii. p. 60. Lecidea carneopallida Nyl. 

 Bot. Not. 1853, p. 183 ; Lich. Scand. p. 196, t. 1. f. 9. Lichen 

 cupularis With. Arr. ed. 3, iv. p. 22 pro parte (i. e. " on trees"). 



