28 LECANO-LECIDEEI [lECIDEA 



29. L. viridescens Ach. Meth. p. G2 (1803). -Thallus effuse, 

 thin, minutely ^aanulose-leprose, pale-greenish (Kf + yellowish, 

 K(CaCl) 4-<^'iinison). Apothccia minute, almost sessile, subconvex, 

 subimmaiginate, opaque, brownish- or livid-black, within dark or 

 whitish ; hypotheciura pale ; paraphyses slender, subconcrete ^ 

 spores ellipsoid, 0,010-13 mm. long, 0,004-6 mm. thick; hymenial 

 gelatine bluish with iodine. — Mudd Man. p. 196 ; Cromb. Lich. 

 Brit. p. 67 ; Leight. Lich. Fl. p. 264 ; ed. 3, p. 262. Lichen 

 viridescens Schrad. Spicil. p. 88 (1794). 



Exsicc. Mudd, n. 164 (as L. jprasina) ; Cromb. n. 81. 



Might at first sight be taken for a lignicolous form of L. granulosa, 

 from which the smaller, constantly darker apothccia, the smaller 

 spores, &c., distinguish it. The apothccia are sometimes solitary or 

 more frequently crowded and confluent. 



Hab. On decayed trunks of trees in upland and maritime wooded 

 districts. — Distr. Only a very few localities in England and the S.AV. 

 Highlands of Scotland. — B. M. New Forest, Hants ; Hurstpierpoint, 

 Sussex ; Oaksey, Wiltshire ; Oswestry, Shropshire ; Hoggart's Wood, 

 Ingleby, Yorkshire ; Barcaldine, Argyll. 



30. L. gelatinosa Floerke in Berl. Mag. 1809, p. 201.— 

 Thallus effuse, thin, leprose-gelatinous, greenish-grey or sub- 

 seruginose (K — , CaCl — ), at times nearly evanescent. Apothecia 

 submoderate, appressed, plane, blackish or livid, with thin, paler 

 margin, at length immarginate, pale-brownish within ; hypo- 

 thecium colourless or pale-yellowish-brown ; paraphyses slender, 

 olive or brownish at the apices ; spores ellipsoid or oblong- 

 ellipsoid, 0,007-9 mm. long, 0,004-5 mm. thick ; hymenial 

 gelatine slightly bluish then tawny-wine-reddish with iodine. — 

 Cromb. Lich. Brit. p. 66 ; Leight. Lich. Fl. p. 299 ; ed. 3, p. 308. 

 L. viridescens var. j3 gelatinosa Mudd Man. p. 196 (1861). 

 Biatora viridescens var. a gelatinosa Koerb. Syst. Lich. Germ, 

 p. 201 (1855). 



Exsicc. Leight. n. 353 ; Larb. Lich. Hb. n. 30. 



Differs from the preceding, of which it has frequently been regarded 

 as a variet3% in the thinner subgelatinous thallus, the plane apothecia 

 and the smaller spores. The apothecia, though numerous, are some- 

 what scattered, becoming at length difform. 



Hab. On the bare ground, rarely incrusting decaying mosses, in 

 upland situations. — Distr. Very few localities in Great Britain and 

 Ireland. — B.M. The Downs, Sussex ; Withiel, Cornwall ; Stiperstones 

 Hill and the Wrekin, Shropshire ; Guisboro' Moor and near Ayton, 

 Cleveland, Yorkshire ; Glen Falloch and Aberfeldy, Perthshire ; Bar- 

 caldine, Argyll ; near Bantry, Cork ; Lough Muck, Connemara, 

 Galway. 



Subsp. prasinorufa Nyl. in Flora Ixv. p. 453 (1882). — 

 Thallus sorediose, the soredia rotundate, somewhat plane, 

 greenish. Apothecia small, immarginate, dark-red, pale within ; 

 hypotheciuni colourless; spores ellipsoid, 0,009-0,010 mm. long, 

 0,004 mm. thick. 



