PERTUSARIA | PERTUSARIACEE 369 
papillate margin ; spores 1-4 in the ascus, olivaceous or blackish 
(K + violet), 100-140 » long, 50-75 » thick.—Leight. Lich. FI. 
ed. 3, p. 228 pro parte ; Cromb. Monogr. i. p. 505. 
Ezxsicc. Larb. Lich. Hb. n. 28. 
Occasionally confused with P. spilomantha, which, however, has a 
single large spore in the ascus. It approaches very closely the 
preceding species, the only real difference being in the papillose 
thallus which may be simply a varietal distinction, but that can only 
be determined by the discovery of further specimens. 
Hab. On granitic stones of a wall in a maritime district.—B. M. 
La Moye, Jersey (the only locality). 
Thallus sorediate ; spores colourless. 
20. P. coccodes Nyl.in Mém. Soc. Sci. Nat. Cherb. v. p. 116 
(1857).—Thallus determinate or effuse, thin, following the in- 
equalities of the bark, subfarinose or isidiose, areolate, occasion- 
ally warted, whitish (K + yellow, then rusty-red). Apothecia 
one or several in scattered or congregate small subglobose 
verruce ; the discs minute, dark-coloured; spores 2 in the 
ascus, 115-140 pw long, 40-60 » thick:—Cromb. Lich. Brit. 
p. 59 & Monogr. i. p. 502 (incl. f. bacillosa) ; form bacillosa Nyl. 
ex Lamy in Bull. Soc. Bot. Fr. xxv. p. 425 (1878). P. globuli- 
fera var. coccodes Mudd Man. p. 274 (1861). Lichen coccodes 
Ach. Lich. Suec. Prodr. p. 10 (1798); Engl. Bot. t. 1511. 
Isidiwm coccodes Ach. Meth. Lich. p. 139 (1803); 8. F. Gray 
Nat. Arr. i. p. 412; Hook. in Sm. Engl. Fl. v. p. 230; Turn. & 
Borr. Lich. Brit. p. 89 (incl. var. phymatodes). I. phymatodes 
Ach. 1. c.? 
Somewhat resembling the thallus of Lecanora parella var. 
Turneri, but easily distinguished by the reaction with potash; 
occasionally the papille are very luxuriant (f. bacillosa), and a 
sorediate form (f. variolaria) is recorded by Harmand (Lich. Fr. v. 
p. 1127 (1918) ). In some specimens there is a pale reddish colour in 
parts (f. phymatodes). British plants are sterile. 
Hab. On trunks of old trees in inland districts.—Dzistr. Rare from 
8S. to N. England.—B. M. New Forest, Hants; Albourne, Sussex ; 
Salperton, Gloucestershire; Hay Park, Herefordshire; near Quendon 
and Hainault Forest, Essex; near Norwich, Norfolk; Baysdale, 
Cleveland, Yorkshire. 
21. P. dealbata Cromb. Lich. Brit. p. 59 (1870) (excl. syn. 
P. lactescens).—Thallus effuse, occasionally with a definite margin, 
of crowded unequal small granules or papille, generally rather 
thick, finely or coarsely cracked-areolate, whitish or ash-grey 
(K + yellow (then frequently red), CaCl —, medulla I + pale 
blue). Fertile verruce prominent, subglobose, containing several 
apothecia, white-pulverulent above; spores 2 in the ascus, very 
I. 2B 
