198 LECANO-LBOIDEEI [bOMBYLIOSPOEA 



greyish-white or -brown (K -|- brownish, CaCl + pale-yellowish- 

 brown, medulla I — ) ; hypothallus thin, black. Apothecia small, 

 black, subsessUe, plane with a thin entire margin ; hypothecium 

 blackish-brown ; paraphyses slender, dark-brown at the apices ; 

 spores 1 or 2 in the ascus, ellipsoid or oblong-ellipsoid, at first 

 colourless, becoming brownish-black, muriform, large, often 

 broadly halonate, 0,040-57 mm. long, 0,023-32 mm. thick; 

 hymenial gelatine deep-blue with iodine. — Bh. Montagnei Flot. 

 ex Koerb. Syst. Lich. Germ. p. 258 (1855) ; Mudd Man. p. 219. 

 Lecidea gemtnata Flot. ex Nyl. in Ach. Soc. Linn. Bord. p. 375 

 (1856) ; Cromb. Lich. Brit. p. 87 ; Leight. Lich. Fl. p. 349 ; 

 ed. 3, p. 377. 



Hab. On alpine rocks. — B. M. Craig Guie, Braemar, Aberdeen- 

 shire. 



79. BOMBYLIOSPORA De Not. in Massal. Ric. Lich. 

 p. 114 (1852). (PL 16.) 



Thallus crustaceous. Algal cells Protococcus. Apothecia 

 Hght- or dark-coloured with a proper margin only ; ascus 1- 

 (8-) spored ; spores large, elongate-ellipsoid, colourless or faintly 

 coloured, without a mucilaginous epispore (not halonate), multi- 

 septate. 



The only representative of this genus in the British Isles has a 

 1-spored ascus. The spermogones have simple sterigmata and 

 cylindrical, straight spermatia. 



1. Bombyliospora incana A. L. Sm. — Thallus effuse, thickish, 

 glaucous-gi-een when wet, creamy-yellow when dry, granular- 

 leprose (K-fyellowish, CaCl — ). Apothecia large, adnate, plane 

 or tumid, reddish-brown, the margin obtuse, persistent, paler ; 

 hypothecium brownish ; paraphyses slender, discrete, bright- 

 yellowish-brown at the tips ; spores elongate-ellipsoid, usually 

 7-10-septate, 0,070-160 mm. long, 0,025-35 mm. thick ; hymenial 

 gelatine yellowish, the asci reddish, with iodine. — Lichen incanus 

 Ach. Lich. Suec. Prodr. p. 7 (1798) ? Sm. Engl. Bot. t. 1683 (1807). 

 Lecidea incana S. F. Gray Nat. Arr. i. p. 470 (1821); Hook. Fl. 

 Scot. p. 38 & in Sm. Engl. Fl. v. p. 181, pro parte ; Tayl. in Mackay 

 Fl. Hib. ii. p. 126? Biatora pachycarpa Fr. Lich. Eur. p. 259 

 (1831). Lecidea pachycarpa Duf. ex Nyl. in Act. Soc. Linn. 

 Bord. ser. 3, i. p. 364 (1856) ; Cromb. Lich. Brit. p. 75 ; Leight. 

 Lich. Fl. p. 336 ; ed. 3, p. 361. Bombyliospora pachycarpa 

 Massal. Ric. Lich. p. 115, fig. 226 (1852) ; Mudd Man. p. 189. 



Sometimes confused with Buellia canescens {Lichen incanus 

 Relhan non Smith) (see p. 166). 



Hab. On the trunks of old trees and on shady rocks in upland 

 wooded districts. — Distr. Only sparingly in a few localities of 

 S. England, N. Wales and S. Ireland. — B. M. New Forest, Hants ; 

 St. Leonard's Forest, Sussex; IJlting, Essex; Cwm Bychan, 

 Jlerioneth ; Dinish Island, Cromaglown, Killarney and Dunkerron, 

 Kerry. 



