LECANORA. | LECANO-LECIDEEL, 425 
105. L. Zoster Nyl. Flora, 1876, p. 577.—Thallus effuse, very 
thin, glaucous-grey, subevanescent (K—, CaCl—). Apothecia 
minute, plane, scattered or aggregate, reddish-brown, naked or 
slightly pruinose ; the thalline margin thin, entire or subcrenate, 
white-pulverulent ; spores 0,011-14 mm. long, 0,006—7 mm. thick ; 
paraphyses very slender, discrete; hymenial gelatine persistently 
bluish with iodine.—Lecanora umbrina subsp. Zostera Nyl., Cromb. 
Journ. Bot. 1874, p. 148; forma Zostere Leight. Lich. Fl. ed. 3, 
p. 191.—Lecanora subfusca var. y. Zostere Ach. Syn. (1814) p. 158. 
Allied to Z. umbrina, but differs in the pulverulent thalline margin of 
the smaller apothecia, the size of the spores, the slender paraphyses, and 
the reaction of the hymenial gelatine. It may be recognized from its 
peculiar place of growth, though Nylander (Flora, 4 ¢.) says that 
LL. Hagen? also occurs zostericolous in Jersey. 
Hab. On old leaves of Zostera marina in maritime districts. Distr. 
Sparingly in the Channel Islands, S.W. England, and S.W. Ireland. 
B.M.: La Moye, Island of Jersey; The Eperquerie, Island of Sark; 
Moulin Huet Bay, Guernsey. Pentire and the Lizard, Cornwall. Kil- 
kee, co. Clare. ; 
106. L. Hageni Ach. Lich. Univ. (1810) p. 367 (excl. vars.) ; Nyl. 
Flora, 1872, p. 250.—Thallus effuse, very thin, leproso-verruculose, 
greyish-white, often nearly obsolete (K—, CaCl—). Apothecia 
small, plane or at Jength convex, pale- or dark-brown, naked or 
cesio-suffused ; the thalline margin thin, subpersistent, crenulate or 
subentire, white; spores 0,009-11 mm. long, 0,005-6 mm. thick ; 
paraphyses thickish, jointed, brownish at the apices; hymenial 
gelatine bluish, then sordid wine-coloured with iodine.—Leight. 
Lich. Fl. p. 208, ed. 3, p. 192.—Z. umbrina var. Hageni Cromb. 
Lich. Brit. p. 51. LZ. albella y. Hageni Mudd, Man. p. 148. 
Lichen Hagent, Ach, Prodr. (1798) p. 57.—Brit. Evs.: Larb. Lich. 
Hb. nos. 131, 219. 
A plant not rightly discriminated by most authors from L. umbrina. 
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, 7. c. These he gives in Witt. as being 0,011-15 mm. long, 
0,0005 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 umcommon 
in England, rare in Scotland, Ireland, and the Channel Islands; not seen 
from Wales.—B. M.: St. Aubin’s Bay, Island of Jersey. Lyndhurst, New 
Forest, Hants; near Ryde, Isle of Wight ; Wellow, near Bath, Somerset ; 
Windsor Great Park, Berks; Brandon, Suffulk; Wimpole Park, Cam- 
bridgeshire; Ayton, Cleveland, Yorkshire; Ennerdale, Cumberland. 
Inverary, Argyleshire ; Achmore, Killin, Perthshire; Portlethen, Kin- 
cardineshire (saxicolous). Castlemartyr, co. Cork; Ballynagarde, co. 
Limerick. 
