lecidea] lecideace^ 19 



cells are described by Th. Fries (Lich. Scand. p. 432), as either globose 

 eugonidia or ellipsoid or oblong leptogonidia. When lignicolous it is 

 var. /3 tlieiotea Ach. in Vet. Ak. Handl. 1808, p. 270, Cromb. in 

 Grevillea i. p. 172, Leight. Lich. Fl. ed. 3, p. 235 ; and when terri- 

 colous and herbicolous it is var. y satura Ach. {fide Th. Fries, I. c). 

 These, however, are mere states, both of which seem to be very rare 

 in Great Britain. The apothecia are usually somewhat scattered. 



Hah. On shady rocks and walls, seldom on decaying trunks of 

 trees and grasses on the ground, in lowland and upland situations. — 

 Distr. General and not uncommon in England, rare in Scotland and 

 the Channel Islands ; not seen fertile in Ireland {fide Carroll). — 

 B. M. Rozel, Jersey ; Guernsey ; Ightham, Kent ; Dawlish and near 

 Chagford, Devon ; Trellick, Monmouthshire ; Knightsford Bridge, 

 Worcestershire ; Llanderfel, near Bala, Cader Idris and Barmouth, 

 Merioneth ; Oswestry, Shropshire ; Ayton Moor, Cleveland, Yorkshire ; 

 near Stavely, Kendal, Westmoreland ; New Galloway, Kirkcudbright ; 

 Glen Creran, Argyll ; Craigforth, near Stirling; Falls of Tummel and 

 Glen Fender, Blair Athole, Perthshire ; Killarney, Kerry. 



18. L. clavulifera Nyl. in Flora lii. p. 294 (1869) & Ixiv. p. 539 

 (1881). — Thallus effuse, thin, granulate or subleprose, the 

 granules often somewhat scattered, white, greyish-green or 

 yellowish-green (K — , CaCl — ). Apothecia minute, convex, 

 immarginate, sordid-ochraceous or testaceous-red, blackish or 

 black ; paraphyses coherent ; epithecium and hypothecium pale ; 

 spores oblong or clavate, very minute, 0,004-6 mm, long, 

 0,001 mm. thick ; hymenial gelatine bluish then tawny-wine-red 

 with iodine. — Cromb. in Grevillea vi. p. 115; Leight. Lich. Fl. 

 ed. 3, p. 255. 



A variable plant as to the colour of the thallus and apothecia ; 

 it is, however, well characterized by the minute, clavate spores. The 

 gonidia are small and minutely clustered. In our saxicolous specimens 

 (in Lapland, where it was originally gathered, it is corticolous) the 

 thallus is very thin and more or less scattered. The apothecia are 

 numerous and constantly convex. 



Hah. On shady rocks and stones of walls in an upland situation. 

 — B. M. Near Clifden, Connemara, Galway (the only locality). 



Form subviridicans Nyl. in Flora Ix. p. 463 (1877). — Thallus 

 greenish. Apothecia and spores as in the type. — Cromb. in 

 Grevillea vi. p. 115; Leight. Lich. Fl. ed. 3, p. 255 (errore 

 suhviridans). 



Exsicc. Larb. Lich. Hb. n. 29. 



Apparently only a state, owing its greener colour to the place of 

 growth. The single specimen seen is but sparingly fertile. 



Hah. On rocks in cave in a mountainous district. — B. M. Dough- 

 ruagh Mt., Connemara, Galway (the only locality). 



19. L. quernea Ach. Meth. p. 62 (1803). — Thallus determinate 

 or effuse, thinnish or submoderate, minutely granulate-pulverulent, 

 yellowish or yellowish-green or pale brownish-yellow (K-f yellow, 



c 2 



