310 PYRENOCARPEI [mICROGL^NA 



4. M. Larbalestierii A. L. Sm. — Thallus thin, brownish, 

 mucilaginous, cracked, wrinkled and scattered when dry. 

 Perithecia immersed in j^the thallus, conical, the ostiole pro- 

 truding ; perithecial wall colourless at the base ; paraphyses 

 slender, numerous; asci large, oblong-cylindrical, 8-spored ; spores 

 oblong-fusiform, colourless, muriform, with many transverse septa 

 and one or more longitudinal divisions, a}>out 0,050-55 mm. 

 long, 0,010 mm. thick. 



Differs from other species of the genus in the habitat and structure 

 of the thallus and in the larger subfusiform spores which taper to 

 somewhat blunt ends. Collected by C. Larbalestier. 



Hab. On rocks in a stream. — B. M. Twelve Pins, Connemara, 

 Galway. 



5. M. Holliana A. L. Sm. — Thallus scanty, whitish, granular 

 or none. Perithecia dark-brown when dry, clear brown when 

 moist, scattered or crowded, sometimes two or more cohering, 

 conical, semi-immersed ; perithecial wall colourless below, be- 

 coming a clear brown upwards ; paraphyses slender, rather scanty, 

 persistent ; asci elongate-oblong, 8-spored ; spores large, ellipsoid - 

 fusiform, sometimes slightly constricted in the middle, colourless, 

 muriform, with small cells, 0,050-60 mm. long, 0,015-17 mm. 

 thick. 



Differs from M. muscicola Lonnr. in the semi-parasitic habit, the 

 colour of the perithecia, and in 8-spored asci. Collected by H. B. HoU. 



Hab. On the ground on thallus of Cladonia, mosses, &c. — B. M. 

 Dolgelley, Merioneth (the only locality). 



111. STAUROTHELE Norm, in Nyt. Mag. Naturv. vii. p. 

 240 (1852) ; emend. Th. Fr. Lich. Arct. p. 263 (1860) & in K. 

 Svensk. Vetensk. Soc. Nov. Act. 1877, 8, p. 3. — Spliasromphale 

 Reichenb. Consp. Reg. Veg. p. 20 (1828) pro parte ; Mudd Man. 

 p. 281 pro parte. (PI. 47.) 



Thallus variously crustaceous, not corticated, sometimes 

 developed within the substratum. Algal cells Pleurococcus. 

 Perithecia simple, superficial or immersed in the thallus with 

 poriform ostioles, and with hymenial gonidia (regal cells) ; 

 paraphyses mucilaginous, disappearing; asci broadly clavate, 

 1 -8-spored ; spores large, ellipsoid, muriform, colourless or dark- 

 coloured. 



Differs from the preceding genus in the presence of hymenial 

 gonidia, which are usually small, roundish, cuboid or slightly elongate, 

 and occur in loose lines or masses between the asci. They are ejected 

 from the perithecium along with the spores. 



S]9ores colourless. 



1. St. hymenogonia A. Zahlbr. in Engler & Prantl Pflanzenf. 

 i. 1'^, p. 57 (1903). — Thallus whitish or pale-grey or brownish, 

 thin, tartareous and somewhat powdery or evanescent. Perithecia 



