CELIDIUM BLITRYDIUM. Ill 



Parasitic on the apothecia, rarely on the thallus of 

 Lecanora glaucoma, where it forms minute black points. 

 Specimen in Larbal., Lich. exs., n. 155, examined. 



BLITRYDIUM. De Not. (figs. 36, 37, p. 91.) 



Ascophore coriaceous-fleshy, orbicular, base narrowed, at 

 first closed and inflated, then splitting above somewhat 

 irregularly, or becoming patellate with an almost entire 

 margin; asci cylindrical, 2-4-8-spored ; spores 1-seriate, 

 broadly elliptical, murifona, hyaline or tinged with colour ; 

 paraph"}- ses present. 



Blitrydium, De Notaris, Disc., p. 20; Sacc., Syll., viii. 

 p. 802. 



Tryblidium, Rebent., Neom., p. 388 ; Cooke, Hdbk., p. 757. 



Readily distinguished by the very large, muriform spores. 



Blitrydium caliciiforme. De Not., Disc. p. 20 ; Sacc., 

 Syll., viii. n. 3293. (figs. 36, 37, p. 91.) 



Scattered or gregarious, depresso-globose, closed at first, 

 then opening by an irregular stellate rupture of the upper 

 part of the excipulum ; disc concave, pallid with a pinkish 

 tinge, grey or blackish when dry; externally blackish- 

 brown, minutely rugulose or verrucose, 1 5-2 5 mm. across ; 

 excipulum indistinctly parenchymatous, cells minute, 

 brownish; asci cylindrical, apex rounded, base narrowed, 

 2-4-spored ; spores 1-seriate, elliptic-oblong, ends obtuse, 

 with a tinge of greenish-yellow, muriform, cells small, 

 numerous, cuboid, 35-55 x 17-21 /*; paraphyses numerous, 

 about 2 p. thick, tips slightly or not at all thickened, 

 sometimes branched, tinged yellow. 



Triblidium caliciiforme, Reb., Neom. p. 388 ; Gooke, Hdbk., 

 p. 757, fig. 358. 



On branches of lime and oak, and on bark. 



The ascophore bursts through a crack in the bark, but 

 when adult and expanded appears to be quite superficial ; 

 base narrowed. Hypothecium thick. 



Blitrydium melaxanthum. Sacc., Syll., viii. n. 3307. 

 Scattered, sessile, globose at first, then expanding and 

 becoming flat ; disc pale dingy yellow ; externally blackish- 

 olive, margin rather fleshy, rugulose, incurved at opposite 



