LKf.'ANORA.] LTXANO-LKCIDKKI, 425 



10."). L. Zosterae Nyl. Flora, 1870, jj. 577. — Thallus efifuse, very 

 thin, glaucous-grey, subevanescent (K— , CaCl — ). Apothecia 

 minute, plane, scattered or aggregate, reddish-brown, naked or 

 slii^htly pruinose ; the thalline margin thin, entire or subcrenate, 

 •white-i)nlvcrulent : spores 0,011-14 mm. long, 0,006-7 mm. thick; 

 parajihyses very slender, discrete ; hymenial gelatine persistently 

 bluish with iodine. — Lecanora umbrina subsp. Zostenn Nyl., Cromb. 

 Journ. JJot. 1874, p. 148; forma Zostene Lcight. Lich. Fl. ed. .'3, 

 p. 191. — Lecanora subfusca var. y. Zosterce Ach. Syn. (1814) p. 158. 



Allied to L. umhrlna, but differs in the pulverulent thalline margin of 

 the smaller ajiotliecia, the s^ize of the spores, the slender paraphyses, and 

 the reaction of the hymeuial gelatine. It may be recognized from its 

 peculiar place of growth, though Nylander (Flora, /. c.) says that 

 L. Hayeni also oc-curs zostericolous in jersey. 



Hab. On old leaves of Zostera marina in maritime districts. Bistr. 

 Sparingly in the Channel Islands, S.W. Euglaud, and S.W. Ireland. — 

 U. M. : La Move, Island of Jersey ; The Eperquerie, Island of Sark ; 

 Moulin Huet Bay, Guernsey. Peutire and the Lizard, Cornwall. Kil- 

 kee, CO. Clare. 



106. L. Hageni Ach. Lich. Univ. (1810) p. .367(excl. vars.) ; XyL 

 Flora, 1872, p. 250.^ — Thallus effuse, very thin, leproso-verruculose, 

 greyish-white, often nearly obsolete (K — , CaCl — ). Apothecia 

 small, plane or at length convex, pale- or dark-brown, naked or 

 csesio-suffused ; the thalline margin thin, subpersistent, crenulate or 

 subentire, white ; spores 0,009-11 mm. long, 0,005-6 mm. thick ; 

 I)araphyses thickish, jointed, brownish at the apices ; hymenial 

 gelatine bluish, then sordid wine-coloured with iodine. — Leight. 

 Lich. Fl. p. 208, ed. 3, p. 192. — L. vmbrinn var. ffar/eni Cromb. 

 Lich. Brit. p. 51. L. albella y. JIar/eni ^[udd, Man. p. 148. 

 Liclien Har/>'ni, Ach. Prodr. (1798) p. 57. — Brit. Evs.: Larb. Lich. 

 Hb. nos. 131, 219. 



A plant not rightly discriminated by most authors from L. nmhrina. 

 Among other marks of distinction, however, as well as in general aspect, 

 it at once differs from this in the .shorter spermatia, as pointed out by 

 Nylander, /. c. These he gives in lift, as being 0,011-1.5 mm. long, 

 0,000.5 mm. thick. The thallus frequently spreads extensively, and is 

 occasionally scarcely visible from the numerous crowded apothecia. These 

 at times become convex with the thalline margin excluded. 



Hab. On trunks (usually decorticated) of trees, old pales, very rarely 

 on schistose rocks, from maritime to upland tracts. — Distr. Not uucommon 

 in Entrlnnd, rare in Scotland, Ireland, and the Channel Island? ; not seen 

 from Wales. — B. M. : St. Aubin's Bay, Island of Jersey. Lyndhur.st, New 

 Forest, Hants ; near Ryde, Isle of Wight ; AVellow, near Bath, Somerset ; 

 Windsor Great Park, B^rks: Brandon, Sutfdk; Wimpole Park, Cam- 

 bridge.shire ; Aytou, Cleveland, Yorkshire ; Ennerdale, Cumberland. 

 Inverary, Argyleshire ; Achraore, Killin. Perthshire : Portlethen, Kin- 

 cardineshire (saxicolous). Castlemartyr, co. Cork; Ballynagarde, co. 

 Limerick. 



