486 ADDITIONAL SPECIES 
Perithecia simple, scattered, with a black peridium, opening by 
an ostiole; periphyses slender; paraphyses disappearing ; asci 
elongate-clavate, soon disappearing, 8-spored ; spores one-celled, 
colourless, cylindrical-vermiform, slightly flexuose or twisted in 
the middle, the ends clavately thickened. 
Sarcopyrenia gibba Nyl.—a, Plant on rock, with peri- 
thecia. b, Vertical section of perithecium. c, Ascus. 
d, Spores. 
A monotypic genus recorded first from Constantine in Algiers, then 
from Switzerland, and from 8.W. Germany. It is distinguished by 
the long vermiform spores. We are indebted to Rev. W. Johnson for 
this interesting lichen collected by him in November, 1880 ; it escaped 
recognition until recently, and was sent to the British Museum for 
determination in December, 1917. In the system of classification 
adopted it should follow Verrucaria. 
8. gibba Nyl. 1. c.—Thallus effuse, thin, yellowish-grey, mostly 
obsolete or immersed in the rock. Perithecia black, scattered or 
congregate, *5jmm. in diam. or less, hemispherical, with a minute 
papillate ostiole, or depressed and Lecidea-like, the outer peridium 
thickish, dimidiate but incurved at the base, the inner wall 
dark-brown ; asci cylindrical fusiform, about 70 p long, 10 p» thick, 
8-spored ; spores 30-40 pw long, 3-3°5 p thick.—Verrucaria gibba 
Nyl. in Cherb. Mém. Soe. Sci. Nat. ii. p. 342 (1854). 
In the specimen on sandstone from St. Bees the thallus is 
extremely scanty, Johnson, however, finds that it is ‘‘ reddish or 
whitish-brown, thin, furfuraceous, occasionally cracked-areolate and 
mostly evanescent; hypothallus white or whitish.’’ The spores seem 
to be almost flat at the centre where they are generally half-twisted 
over. 
Hab.—On arenaceous rocks.—B. M. St. Bees, Cumberland. 
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