PEZIZA. 425 



cells irregularly polygonal ; asci cylindrical, 8-spored ; spores 

 obliquely l-seriate, contiQuous, hyaline (rarely tiiiged 

 brown), elliptical, episporo smootb or rougt.; paraphyses 

 present. 



Peziza, DiUenius, Xov. Gen. Plant., p. 76; Sacc, SyU., 

 viiL p. 76 ; Phil., Brit. Disc, p. 43 (in part). 



Most closely allied to Humaria, differing in the larger size 

 of the ascophores, and the warted or scurfy exterior. 



Growing on the ground. 



* Epispore smooth. 



f Disc hrown or blackish-hrmon. 



Peziza vesiculosa. Bull., Champ. Fr., p. 27, t. 457, 

 f. 1; Phil., Brit. Disc, p. 73; Cooke, Mycogr., fig. 242; 

 Sacc, Syll., viii. n. 297. 



Clustered, often distorted from mutual pressure, sessile but 

 more or less narrowed at the base, globose and closed at 

 first, then expanding, but the margin usually remaining 

 more or less incurved and somewhat notched; disc pale 

 brown, externally brownish and coarsely granular from the 

 presence of minute, irregular warts, 3—7 cm. across ; exci- 

 pulum parenchymatous, cells irregularly polygonal, large, 

 especially those forming the central zone, external cells 

 brownish, growing out into small warts ; asci cylindrical, 

 8-spored; spores obliquely l-seriate, smooth, hyaline, con- 

 tinuous, elliptical, ends obtuse, 21-24 x 11-12 fi; para- 

 physes slender, septate, clavate. 



HelveUa vesiculosa, Bolton, t. 175. 



On rich soU, manure heaps, rotten leaves, &c. 



Specimen in Phil., Elv. Brit., n. 13, examined. 



L'sually sessile with base of ascophore narrowed, but 

 sometimes the narrowing is so marked that a more or less 

 elongated stem-like base is produced. Cells of excipulum 

 large, especially at the base of the ascophore, where the 

 median cells are so large and thin-walled that they usually 

 deliquesce before the fungus is mature, and in consequence 

 the hymenium becomes separated from the outermost portion 

 of the excipulum by a slit. Substance brittle. 



