308 PYKKNOCARPKI JTHROMBIUM 



(1831). Segestrella thelostoma height. Angioc. Lich. p. 34, t. 15, 

 f. 2 (1851). Leranora thelostoma Hook, in Sm. Engl. Fl. v. 

 p. 189 (1833). 



Distint^uished by the wide depreHHion round the scarcely visible 

 ostiole, hence the resemblance to a Lecanorine apothecium, 



Hab. On whinstone rocks. — B. M. Egglestone, Durham. 



109. GONGYLIA Koerb. Syst. Lich. Germ. p. 351 (1855). 

 (PI. 45.) 



Thallus crustaceous, not corticated. Algal cells Pleurococrus. 

 Perithecia almost sessile, soft in texture, bright- or dark-coloured 

 with a poriform ostiole ; paraphyses slender, free ; asci 4-8 

 spored ; spores acicular, straight or somewhat bent, colourless, 

 multiseptate. 



A small genus, with representatives in North and Central Europe. 

 The ostiole is very distinct, and tends to widen out at maturity, 

 causing the perithecia to become almost disciform. 



1. G. viridis A. L. Sm. — Thallus bright-green when fresh, 

 thin, spreading. Perithecia numerous, shining-black when moist, 

 globose, slightly immersed at the base, the ostiole very distinct, 

 becoming wider ; perithecial wall soft, black, rather uneven on 

 the exterior, dimidiate, the inner wall dark blue-green ; asci 

 elongate-clavate, bent at the base, about 0,140 mm. long, 

 0,010-12 mm. thick ; paraphyses longer than the asci, numerous, 

 thread-like ; spores narrowly fusiform- acicular, somewhat abruptly 

 narrower upwards or blunt, gradually tapering towards the base, 

 colourless, multi-guttulate becoming multi-septate, 0,060-65 mm. 

 long, 0,002-3 mm. thick. 



The thallus follows the inequalities of the soil, and thus shows a 

 somewhat granular surface ; it is nearly allied to G. sabuletorum, a 

 species found in Central Europe, but differs in the thallus and the 

 much longer spores. 



Hab. — On sandy soil by the side of a path. — B. M. Near Horsley, 

 Surrey (the only locality). 



110. MICROGLJINA Koerb. Syst. Lich. Germ. p. 388 

 (1855) ; emend. Lonnroth in Flora xli. p. 632 (1858). TheleneUa 

 Nyl. in Maine et Loire Mem. Soc. Acad. iv. p. 62 (1858) ; 

 see also Part i. p. 15. (PI. 46.) 



Thallus crustaceous, non-corticated. Algal cells Pleurococcus. 

 Perithecia simple, immersed or almost free, globose or conical ; 

 paraphyses persistent, branched; asci 2-8-spored; spores ellipsoid, 

 muriform, colourless or brownish. 



1. M. modesta A. L. Sm. — Thallus whitish, thin, continuous 

 or somewhat cracked and unequal. Perithecia embedded in 

 small protuberances of the thallus, subglobose ; perithecial wall 

 soft and colourless at the base, brownish upwards to dark-brown 



