HELVELLA. 459 



hyaline, continuous, elliptical, ends obtuse, 17-18 X 9-10 /x. ; 

 paraphyses hyaline, septate, slender, slightly clavate, a trifle 

 longer than the asci. 



On the ground. Autumn. Edible. 



Specimen in Phil., Elv. Brit., n. 102, examined. 



Distinguished from all other species by the stout, costate, 

 lacunose, hollow stem ; entirely glabrous, fragile, and with a 

 semi-transparent look. Colour variable, included under the 

 following forms : 



Forma alba. Pileus whitish. 



Forma Grevillei. Under surface of the pileus reddish ; 

 stem white. 



Forma incarnata. Pileus and stem flesh-colour. 



Forma fulva. Pileus yellowish or tawny. 



Helvella lacunosa. Afzel., Vet. Ac. Hd., 1873, p. 30.5 ; 

 Phil., Brit. Disc., p. 11; Sacc., Syll., viii. 11. 46. 



Ascophore irregular, often irregularly inflated, dark grey 

 or blackish-grey, irregularly lobed, loi>es drooping and at- 

 tached to the stem by the under curface, H-5 cm. high; 

 exoipulum composed of densely interwoven hyphae, which 

 run out at the periphery into parallel, clavate, septate 

 hyphae, 10-20 //, thick at the tip; stem, 1-5-5 cm. long, 

 |-1^ cm. thick, variously ribbed or lacunose, pallid ; as'.-i 

 cylindrical, 8-spored; spores obliquely 1-seriate, broadly 

 elliptical, ends obtuse, smooth, hyaline, continuous, with 1 

 very large globose oil-globule, 1820x1012 /JL ; paraphyses 

 septate, becoming gradually clavate up to the brownish tip, 

 which is 6-10 p thick. 



Helvella sulcata, Afz., Vet. Ac. Handl., 1873. p. 306; Phil., 

 Brit. Disc., p. 12 ; Sacc., Syll., n. 48. 



On the ground in woods. Spring and autumn. 



Solitary or gregarious; very variable in size, as also in 

 the inflation ot the ascophore and the ribbing of the stem, 

 but an examination of numerous specimens in various ex- 

 siccati under both names given above proves that all are 

 forms of one variable species, and all agree in the above 

 characters. 



Helvella infula. Schaeff., Fung. Bavar. et Palat., 

 pi. 159 ; Cooke, Mycogr., fig. 334 ; Phil., Brit. Disc., p. 13 ; 

 Gillet, Disc. Fr., p. 11 ; Sacc., Syll., viii. n. 57. 



