SYNALISSA | PYRENOPSIDACE® 41 
might be the type of a new genus Synalissina. Apothecia haye not 
been found, but spermogones are present in the British specimen. 
Hab. On moist granite rocks in an upland region.—b, M. New 
Galloway, Kirkeudbrightshire (the only British locality). 
20. PSOROTICHIA Massal. Framm. Lich. p. 15 (1855); 
emend. Forssell in K. Vetensk.-Soc. Nova Acta, ser. 3, xill. 
n. 6, p. 66 (1885). Collemopsis Nyl. in Flora lvi. p. 17 (1873) 
(note) ; Cromb. in Journ. Bot. xii. p. 332 (1874) & Monogr. i. 
pati. (Fl. 20.) 
Thallus crustaceous, granular-areolate, more or less corticated 
and loosely affixed to the substratum. Algal cells Gloocapsa, 
sect. Xanthocapsa. Apothecia innate, urceolate, small, the margin 
usually tumid and connivent ; paraphyses usually simple, slender, 
and discrete ; spores 8 in the ascus, ellipsoid, simple, colourless. 
Spermogones with simple sterigmata and oblong minute acrogenous 
spermatia. 
Closely allied to Pyrenopsis, but differing in the yellow colour of 
the algal sheath. It also somewhat resembles Pannularia, but is 
outwardly distinguished from that genus by the absence of a 
hypothallus. 
1. Ps. Schereri Arn. in Verh. K. K. Zool.-Bot. Ges. Wien 
xxii. p. 313 (1872).—Thallus effuse, granular-areolate or minutely 
granular-squamulose, rather thin, brownish-black. Apothecia 
small or moderate in size, plane, with a distinct thalline margin, 
brownish or reddish-black ; spores ellipsoid, 14—21 » long, 7-11 p 
thick ; hymenial gelatine pale-blue and then tawny with iodine. 
-—Pannaria Schereri Massal. Ric. Lich. p. 114 (1852). Pyrenopsis 
Schxreri Nyl. in Flora xlix. p. 374 (1866); Cromb. Lich. brit. 
p- 2; Leight. Lich. Fl. p. 15. Collemopsis Scherert Cromb. in 
Journ. Bot. xii. p. 332 (1874) & Monogr. i. p. 78; Leight. Lich. 
Fl. ed. 3, p. 35. 
Exsicc. Johns. n, 242. 
The thallus is more squamulose and continuous as it becomes 
more fully developed. The apothecia are usually numerous and 
crowded. 
Collema trachyopum Tayl. (Lond. Journ. Bot. vi. p. 1938 (1847) ) 
is referred by Tuckerman to this species (Prof. Farlow in litt.). The 
specimen was collected by Taylor on limestone at Durham, Kerry. 
Hab. On cretaceous pebbles, and limestone walls and rocks in 
moist shady situations.—Distrv. Not uncommon in England, among 
the Grampians, Scotland, and in W. Ireland.—B. M. Near Gom- 
shall and Shiere, Surrey; Bathampton Downs and Babington, 
Somerset; Chelford, Oakley Park, and near Cirencester, Gloucester- 
shire; Buxton, Derbyshire ; Egremont, Cumberland; Craig Tulloch, 
Blair Athole, Perthshire; Craig Guie, Aberdeenshire; Kylemore, 
Galway. 
2. Ps. furfurella Boist. Nouv. Fl. Lich. Part 2, p. 312 
(1902).—Thallus effuse, thin, furfuraceous-granular, or in small 
