164 r,K('AN()-LKc;iJ)KKl | BACIDIA 



27. B. flavovirescens An/.i Cat. Licli. Sondr. p. 71 (I860).-— 

 Tballus l)right-grooiiish-yell(AV, offuso, thin or thickish, finely 

 granular or pulverulent (K — , CaCl — ); liypothallus filamentous, 

 dark-brown or blackish. Apotliecia black, solitary or con- 

 glomerate, appressed, at fii'st concave, then plane, with a 

 thickish obtuse margin, the disc granular ; hypothecium brownish- 

 black ; paraphyses slender, hyaline, greenish-yellow in thick 

 section ; spores acicular, pluriseptate, 0,036-100 mm. long, 

 0,003-4 mm. thick ; hymenial gelatine not tinged with iodine. — 

 Lichen JJavovireseens Dicks. Crypt, fasc, iii. p. 1 3 t. 8, f. 9 

 (1793); With. Arr. ed. 3, iv. p. 12. L. ciirinelhis Ach. in Vet. 

 Acad. Handl. xvi. p. 135, t. 5, f. 5 (1795); Engl. Bot. t. 1877. 

 Lccidea citrmclla Ach. Meth. p. 15 (1803) ; S. F. Gray Nat. 

 Arr. i. p. 46G ; Cromb. Lich. Brit. p. 94 ; Leiglit. Lich. Fl. 

 p. 339 ; ed. 3, p. 336. L. flavovirescens Borr. ex Hook, in Sm. 

 Engl. Fl. V. p. 178 (1833); Tayl. in Mackay Fl. Hib. ii. p. 122. 

 liaphiospora flavovirescens Koerb. Syst. Lich. Germ. p. 268 (1855) ; 

 Mudd Man. p. 186, t. 3, f. 70. 



Exsicc. Leight. n. 303. 



A conspicuous plant from the contrast between the brightly- 

 coloured, scattered or continuous thallus and the dark substratum, to 

 which it is loosely affixed. On account of the prominent, somewhat 

 carbonaceous margin of the apothecium, and the elongate-acicular 

 spores, it has been variously classified by authors under Lecanactis 

 or Rajjliiospora. Th. Fries (Lich. Scand. p. 343 (1874)) regards 

 B. fiavo-virescens as a discomycetous fungus parasitic on the thallus 

 of Sjphyridium byssoides {Bceomyces ruftis). The gonidia, he 

 considers, belong to the latter plant, their bright colour being caused 

 by the action of the parasite on the host. Rehm has included it in 

 his genus Mycohacidiuin (Babenh. Krypt.-Fl. i. 3, p. 388 (1896)), but 

 states that the question of parasitism is by no means decided. 



Hah. On the gromid and among mosses on rocks in hilly or sub- 

 alpine localities. — Distr. Apparently local, though plentiful where it 

 occurs in EnglB.rid and "Wales, conmion in the Highlands of Scotland, 

 rare in Ireland. — B. M. Hay Tor, Dartmoor, Devon ; Builth, Breck- 

 nockshire ; Llyn Gwernon and Dolgelly, Merioneth ; Oswestry, Shrop- 

 shire ; Bettws-y-Coed, Carnarvonshire ; Llangollen, Denbighshire ; 

 Stavely, Westmoreland ; Teesdale, Durham ; near Helensburgh, Dum- 

 bartonshire ; Glen Creran, Argyll ; Glen Lochay, Killin, Craig Calliach, 

 Ben Lawers, Eannoch and Craig Tulloch, Blair Athole, Perthshire ; 

 Canlochan Glen, Forfarshire ; Morrone, Braemar, Aberdeenshire ; 

 Hills of Applecross, Rossshire ; Wicklow ; near Dunkerron, Kerry ; 

 Doughruagh Mt., Conneniara, Galway. 



Yii,v. alpina A. L. Sm. — Thallus areolate, in crumlj-like 

 masses, sublobulate at the circumference. Apothecia plane 

 or slightly convex, often congregate. — Lecidea flavovirescens 

 var. /3 alpina Schser. Spicil. Lich. Helv. p. 162 (1833). 



Distinguished by the more developed thallus. Lichen flavovi- 

 rescens var. 2, With. (/. c.) erroneously referred by Crombie 



