216 CYCLOCARPINEE [PLACODIUM 
thalline margin thin, disappearing, otherwise like the species.— 
Pl. Agardhianum Hepp Flecht. Eur. n. 407 (1857) (non Ach.) ; - 
Leight. Lich. Fl. ed. 3, p. 165.  Lecanora variabilis var. 
ecrustacea Nyl. ex Cromb. in Grevillea xviii. p. 46 (1889) & 
Monogr. i. p. 391. 
Ezsicc. Johns. n. 151. 
Owing to the scanty development of the superficial thallus the 
apothecia are almost non-marginate. They are less covered with 
pruina than in the species, and are sometimes semi-immersed. 
Hab. On ealeareous rocks in maritime and upland districts.— 
Distr. Rare in 8.W. and N.W. England and 8. Wales.—B. M. 
Anstey’s Cove, Torquay; Bathampton Downs, Somerset; Tenby, 
Pembrokeshire ; Silverdale, Lancashire ; Lamplugh, Cumberland. 
Thallus greyish-white (K—). 
23. Pl. pheocarpellum A. L. Sm.— Thallus . effuse, thin, 
greyish-white, often evanescent (K—). Apothecia small, plane, 
with a thin proper margin, or convex, the dise brown or dark- 
brown (K+ crimson becoming purple); paraphyses slender, 
branched upwards and septate at the tips; spores ellipsoid, 
14-18 p long, 6-11 p thick.—Lecanora pheocarpella Nyl. in 
Flora Ixiii. p. 388 (1880) ; Cromb. in Grevillea xix. p. 60 (1890) 
& Monogr. i. p. 378. L. nigricans Cromb. in Grevillea xviii. 
p- 45 (1889) (non Tuckerm.). 
The colours of the apothecia distinguish this species from all 
others. The epithecium is crowded with small cells budded off from 
the paraphyses, and deeply suffused with brown lichen-acid, which 
becomes crimson with potash. ‘ 
Hab. On the trunk of a tree in a mountainous region.—B. M. 
Craig Cluny, Braemar, Aberdeenshire. ' 
24, Pl. refellens A. L. Sm.—Thallus thin, unequal, continuous 
or furfuraceous, greyish (K—). Apothecia small, plane, pale- 
reddish, with a thin thalline margin, somewhat pulverulent, at 
length clisappearing (K—); paraphyses thickish, slightly clavate 
and septate upwards ; spores distinctly polarilocular with central 
canal, ellipsoid, 9-11 p» long, 5-7 p thick.—Lecanora refellens 
Nyl. in Flora Ix. p. 458 (1877); Cromb. in Grevillea vi. p. 111 
(1878) & Monogr. i. p. 389; Leight. Lich, Fl. ed. 3, p. 213. 
Exsice. Larb. Lich. Hb. n. 24. 
An abnormal species lacking the presence of parietin both in 
thallus and apothecia. It is possibly an impoverished development 
of Pl. cerinum. 
Hab, On the trunks of poplars.—B. M. Cleghan, Connemara, 
Galway (the only locality). 
25. Pl. erythrocarpum A. L. Sm.—Thallus subdeterminate, 
crustaceous, thin, furfuraceous, granular and areolate or some- 
; 
es 
