498 LICHEXACEI. [PERTUSARIA. 



Hub. On trunks and branches of trees in wooded upland tracts. — Distr. 

 Very sparingly in S. England, N. Wales, and 8. Ireland. — B. M.: St. 

 Leonard's Forest, Sussex ; near Rusthall Common, Kent ; Quarn Wood, 

 Isle of Wight ; New Forest, Hants ; East Lulworth, Dorsetshire ; Ivy 

 Eridf^e, S. Devon ; Island of Auglesea. Castlemartyr, co. Cork. 



Form aspergilla Cromb. Grevillea, xix. (1891) p. 59. — Fertile 

 verrucce scattered, elevated, scarcely margined, white-pulverulent ; 

 otherwise as in the type. — Variolaria asjyerr/iUa Turn. & Borr. Lich. 

 Br. p. 67 ; Sm. Eng.'Fl. v. p. 170; Eng. Bot. t. 2401 ; Tayl. in 

 Mack. Fl. Hib. ii. p. 112. V. communis var. y. aspergilla Gray, 

 jS^at. Arr. i. p. 491. Lichen aspergillus Ach. Prodr. (1798) p. 28 ? 



Dififers in the character of the verrucfe ; while in the British specimens 

 seen the thallus is also thinner. Our plant, which is that of Turner and 

 Tion-ev pro 7na.vima jyarte, may he different from that of Acharius and 

 other authors, who speak of it as only saxicolous. 



Hub. On trunks of trees and pales in upland situations. — Distr. Only a 

 few localities in S. and Central England. — B. M. : Ickworth, Suffolk ; 

 Sevenoaks, Kent ; St. Leonard's Forest, Sussex ; Shiere, Surrey ; New 

 Forest, Hants ; Gopsall Park, Leicestershire ; Hay Park, Herefordshire. 



11. P. reducta Stirt. Scottish Naturalist, iv. (1877) p. 28.— 

 Thallus thin, rimuloso-areolate, greyish or greyish-brown (K + yeUow, 

 then deep red). Apothecia sessile, lecanorine, inclosed in mono- 

 carpous thalline verrucae, brown or reddish-brown, caesio-pruinose ; 

 spores 0,09-14 mm. long, 0,03-04 mm. thick. — Leight. Lich. Fl. 

 ed. 3, p. 229. 



The author says I. c. that it is " closely allied to P. vudtijjuncta ; " but 

 from this it is widely separated by the type of the apothecia and the 

 thalline reaction. I have seen no specimen. 



Ilab. On trees in a mountainous region. — Distr. Local and rare in the 

 S.W. Highlands of Scotland (Ben Brecht, Argyleshire). 



12. P. lactea Nyl. Flora, 1881, p. 539. — Thallus determinate, 

 smooth, rimoso-areolate, subeffigurate at the circumference, greyish 

 or whitish (K — , CaCl-t- reddish). Apothecia lecanorine, small, 

 scattered, white, subleprose above, the thalline margin irregular ; 

 spores 0,0180-205 mm. long, 0,063-70 mm. thick.— Cromb. Gre- 

 villea, xix. p. 59. — Variolaria lactea Gray, Nat. Arr. i. p. 492; 

 Hook. Fl. Scot. ii. p. 46 ; Turn. & Borr. Lich. Br. p. 62 ; Sm. Eng. 

 Fl. V. p. 170 ; Tayl. in Mack. Fl. Hib. ii. p. 113. Pertusaria lac- 

 tescens /3. lactea Mudd, Man. p. 272. Lichen lacfeus Linn. Mant. 

 (1767) p. 132 ; Huds. Fl. Angl. ed. 2, p. 526 ; With. Arr. ed. 3, iv. 

 p. 5 ; Eng. Bot. t. 2410. 



A plant whose systematic place was doubtful till the recent discovery 

 of the fructification, which renders it a very well-marked species. The 

 thallus, though orbicular, usually spreads very extensively over the sub- 

 stratum, varviug somewhat in thickness, the sterile verrucae being at 

 times numerous and subcontlueut in the ai-eolse. ^^■ith us it is very 

 rarely fertile. 



