452 FUNGUS-FLORA. 



18-22 x 12-14 yu; paraphyses straight, septate, the brownish, 

 clavate tip 5-6 p. thick. 



Peziza acetalulum, Linn., Sp. PL, ii. 1650; Phil., Brit. 

 Disc., p. 44, pi. iii., fig. 11. 



On the ground. Spring. 



The fluted stem and veined outside of the excipulum mark 

 the present species. The colourless hypothecium is com- 

 posed of very densely and compactly interwoven hyphae. 



Acetabula leucomelas. Boud., Bull. Soc. Myc., i. 

 p. 100; Sacc., Syll., viii. n. 195. 



Ascophore stipitate, cup-shaped, 3-4 cm. broad and high, 

 fleshy, rather tough ; disc blackish-grey, margin often 

 irregular ; externally pallid or whitish, minutely rough ; 

 stem about ^-1 cm. high, | cm. thick, pale, stuffed, externally 

 lacunose or fluted, the ridges not extending to the asco- 

 phore ; the cortical cells grow out in little clusters , asci 

 cylindrical, 8-spored ; spores hyaline, smooth, continuous, 

 broadly elliptical, ends obtuse, with one very large oil- 

 globule, 22-24 x 12 p. ; paraphyses septate, 5-6 /j. at the 

 brownish, clavate tips. 



Peziza leucomelas, Pers., Myc. Eur., i. p. 219, t. xxx., fig. 

 1, a-c. 



On the ground in woods. 



Specimen from Persoon in Hb. Kew, examined. 



Distinguished from A. vulgaris by the whitish exterior, 

 and the ribs on the stem not running up the ascophore. 

 Hypothecium very compactly interwoven, hyaline. Sac- 

 cardo says the spores become asperate ; this character I have 

 not observed. 



Acetabula Percevalii. Mass. 



Solitary, stipitate, margin incurved and closed when 

 young, then becoming saucer-shaped, the extreme margin 

 still incurved, rather fleshy, 2-3 cm. across ; disc umber 

 brown, externally paler, margin whitish, minutely rough ; 

 stem 23 cm. long, 1 cm. thk-k, usually narrowed down- 

 wards, more or less distinctly longitudinally sulcate or 

 lacunose, pale ; hypothecium and excipulum composed of 

 loosely, interwoven, branched, septate, hyaline hyphae, 3-4 /A 

 thick, running out into a parenchymatous cortex of irregu- 

 Jarly polygonal cells. 5-7 /u. diameter; asci cylindric-clavate, 



