110 FUNGUS-FLOEA. 



Peziza (MolUsia) litoralis, Phil. & Plow., Grevillea, vol. iv. 

 p. 121, pi; 62, fig. 4. 



Patellaria litoralis, Brit. Disc, p. 368. 

 On dead wood washed up from a lock. 

 Not examined. 



CELIDIUM. Tul. (emended.) (figs. 14-17, p. 12.) 



Ascophore parasitic on the thallus or apothecia of lichens; 

 innate, ernmpent, plane or becoming convex, blackish; 

 excipulum incomplete or absent; asci clavate, sessile, wall 

 often thickened at the apex, 6-8-spored ; spores 3-septate, 

 hyaline ; paraphyses numerous, longer than the asci, more or 

 less adhering to each other. 



Celidium, Tulasne, Mem. p. 121 (1852) ; Sacc, Syll., viii. 

 p. 742. 



Arthonia, Leight., Lichen PL p. 414 (in part). 



Lecidea, Leighton, Lich. Fl., p. 240 (in part). 



The members of the present genus have until recently 

 been considered as belonging to the Lichenes (= Lichen- 

 fungi) ; but as there is no trace of a thallus, the algal 

 element (gonidia) is necessarily absent; the fungal part, 

 having its mycelium ramifying in the living tissues of its 

 host, and its reproductive portion formed at the surface, 

 alone being present. 



Celidium varians. Arnold, Plora, 1862, p. 313 ; 

 Sacc, Syll., viii. n. 3044. (figs. 47-51, p. 12.) 



Ascophore about 1 mm. across, dull black, more or less 

 circular, plane then slightly convex, disc minutely rugulose, 

 scattered or confluent ; epithecium blackish green, internally 

 brownish ; asci obovate, base broad, sessile, wall very much 

 thickened at the apex, 8-spored; spores in 2-3 irregular 

 rows or altogether inordinate, oblong or oblong-clavate, ends 

 obtuse, hyaline, 3-septate at maturitj% often for a long time 

 1-2-septate, 12-17 X.5-7 //.; paraphyses numerous, longer 

 than the asci, septate, somewhat clavate and blackish olive 

 above, agglutinated together, 3-4 /i thick above. 



Lichen varians, Dav., Trans. Linn. Soc, ii. p. 284 (1793). 



Arthonia varians, Leighton, Lichen Flora, p. 426. 



