348 LICHEN ACEI. [lEPEOLOMA. 



59. LEPEOLOMA Xyl. Flora, 18S3, p. 107.— Thallus mono- 

 phyllo-lobate, submembranaceous, soft, pulverulent on the surface, 

 containing gonidia. Apothecia and spermogones unknowTi. 



A pseudo-genus separated by Xylander from Amphiloina (now restricted 

 to exotic species) on account of the thallus b'inor leprarioid and always 

 sterile. Indeed in Lich. Scaiid. p. li>9, he had said in resravd to the single 

 species of which it consists, " it is possible that our lichen may be a de- 

 graded state of a type which we do not yet know."' In the absence of 

 fructification, its systematic place is quit« uncei-tain. 



1. L. lanuginosom Xyl. ?. c. — Thallus orbicular or subeffuse, 

 granuloso-])ulverulent in the centre, white or yellowish-white, lobes 

 Bubimbricate, adpresso-adnate (£ — ) ; hypothallns tomentose, 

 bluish-black. — Cromb. Grevillea, xviii. p. 44. — Ampliilouui lanugi- 

 nosum Mudd, Man. p. 126 : Cromb. Lich. Brit. p. 44 ; Leight. Lich. 

 Fl. p. IT'J, ed. 3, p. 156. Squamaria lanuginosa Sm. Eng. Fl. v. 

 p. 53. Parmelia lanuginosa Hook. Fl. Scot. ii. p. 53 ; Gray, Xat. 

 Arr. i. p. 439 ; Tayl. in Mack. Fl. Hib. ii. p. 148. Lichen Jamigi- 

 nosus Aeh. Prodr. ( 1 79>) p. 120. Lichen menihranacens Dicks. Crypt, 

 fasc. ii. p. 21,t. 6.f. 1 ; With. Arr. iv. p. CA.—Brit. Exs.: Leight. 

 n. 55 ; Larb. Lich. Hb. n. 332. 



The thallus, which is moderate, or at times somewhat expanded, is 

 occasionally granuloso-pulverulent almost throughout, so that the lobes 

 are nearly obliterated. It is never seen except sterile, though apothecia 

 have been described both by Dickson and Acharius : by the former as 

 being "few, minute, pale-yellow," and by the latter as "minute, reddish, 

 with pulverulent margin." Apart from the discrepancy as to colour, these 

 evidently were not the true fructification. 



Hab. On decaved mo.-ses on shaded rocks, chiefly granitic and schistose, 

 in maritime and upland situations. — iJistr. General and not uncommon 

 in the mountainous tracts of Groat Britain and probably also of Ireland ; 

 rare in the Channel Islands. — B. M. : Eozel, Island of Jersey ; Island of 

 Gtuernsey. Lustleigh Cleeve, S. Devon ; Roche Kock, Cornwall : Bardon 

 Hill, Leicestershire ; Malvern, Worcestershire ; Longmyud Hill and 

 Stiperstones, Shropshire ; Barmouth, Merionethshire ; Falcon Clints, 

 Durham ; Keutmere, Westmoreland ; Wa.-tdale, Cumberland. Black 

 Craig, Xew Galloway, Kirkcudbrightshire; Ben Lomond. Dumbarton- 

 shire ; Achrosagan Hill, Appin : The Trossachs and Craig Calliach, Pertli- 

 shire : Canlochan, Forfarshire: Craig Cluny, Braemar, Aberdeenshire; 

 Glen Xevis, Inverness-shiiv ; near Lairg, Sutherlandshire. Bonane, near 

 DunkeiTon, co. Ken-y. 



60. LECANORA Ach. Lich. Univ. (1810) p. 77 ; Xvl. emend. Xot. 

 SaUsk. pro F. et Fl. F. Forh. v. (1866) p. 125.— Thallus radiato- 

 laciniate, squamulose, granulose, rarely leprose or evanescent. Apo- 

 thecia lecanorine, occasionally biatoroid ; spores usually 8nae, 

 seldom numerous, ellipsoid or oblong, rarely fusiform, simple or 

 sometimes locular or septate, usually colourless : hymenial gelatine 

 variously tinged with iodine. Spermogones with jointed, rarely 

 simple sttrigraata and vanous spcrmatia. 



