444 LICHENACEI. [LECANORA. 
Lecania erysibe Mudd, Man. p. 141 pro parte, t. ii. f. 47.—Lichen 
erysibe Ach. Prodr. (1798) p. 50.—L. erysibe 3. Rabenhorstix (Hepp), 
Mudd, Man. J. c. is entirely confluent with the type—Brit. Hus. : 
Mudd, nos. 104, 105. 
A very variable plant, the differences in the thallus and apothecia of 
which give rise to the forms, varieties, and subspecies that follow. With 
its usually biatoroid apothecia it is at times not unlike Lecidea rubella 
(Ehrh.), of which Acharius (Lich. Univ. p. 196) makes it a variety. 
The apothecia are occasionally aggregate, and become darker in age. 
The spermogones, which are not very frequent in our specimens, have the 
spermatia 0,015-18 mm. long, 0,0005 mm. thick. 
Hab. On rocks, very rarely on decorticated trunks of trees, in maritime 
and upland districts Distr. Here and there throughout Great Britain ; 
apparently rarer in the Channel Islands and Ireland.—B. M.: St. Aubin’s 
Fort, St. John’s and St. Brelade’s (lignicolous), Island of Jersey. Rot- 
tingdean Cliffs, Sussex ; near Torquay, 8. Devon; near Penzance, Corn- 
wall; Norton, Worcestershire; near Ayton and Coatham, Cleveland, 
Yorkshire ; St. Bees, Cumberland. Island of Lismore and Barcaldine, 
Argyleshire; Portlethen, Kincardineshire ; Craig Guie, Braemar, Aber- 
deenshire. Lower Glanmire Road, co. Cork; near Kilkee, co. Clare; 
co. Down. 
Form cinereofusca, Cromb. Grevillea, xviii. (1890) p. 69.— 
Thallus very thin, greyish-brown. Apothecia minute, plane, at 
length convex, dark-brown, slightly pruinose ; spores indistinctly 1- 
septate, often 2-3-nucleolate.—Lecania erysibe var. 5. cinereofusca 
Mudd, Man. (1861) p. 141, t. 2. f. 48.— Brit. Has.: Mudd, n. 106. 
Only a form with thinner thallus and smaller subpruinose apothecia, 
the pruina disappearing in age. Apparently it is confluent with the type 
and results from the habitat. 
Hab. On rocks and walls in maritime and upland tracts.—Distr. Only 
sparingly in 8., W., and N. England.—B. M. : Hastings, Sussex; Crowle, 
near Worcester ; near Ayton, Cleveland, Yorkshire, 
Var. 3. sincerior Nyl. Flora; 1876, p. 577.—Thallus subgranu- 
late, areolato-rimose, pale-greyish or subochraceo-whitish. Apo- 
thecia lecanorine, pale-brown, the thalline margin persistent.— 
Cromb. Grevillea, v. p. 108; Leight. Lich. Fl. ed. 3, p. 219. 
Differs in the colour of the more granulate thallus and in the per- 
sistently lecanorine apothecia. Nylander /. c. observes that it may rank 
as a subspecies. 
Hab. On schistose and arenaceous rocks and walls in maritime tracts.— 
Distr. Found sparingly in the Chaunel Islands, 8. and N. England, and 
N.W, Ireland.—B. M.: La Coupe, Island of Jersey. Hastings, Sussex ; 
near Torpoint, 8. Devon; St. Bees, Cumberland; North Tyne, North- 
umberland. Lettermore, Connemara, co, Galway. 
Subsp. 1. L. albariella Nyl. Flora, 1881, p. 454,—Thallus areo- 
lato-diffract, whitish-cream-coloured. A pothecia biatorine, small or 
submoderate, brown or brownish-black ; spores ovoid, 1-septate, 
0,012-16 mm. long, 0,005 -6 mm. thick ; hymenial gelatine at length 
