338 University of California Publications in Botany [Vol. 6 



Hydnotryopsis Setchellii o:en. et sp. nov. 



Plate 30, figs. 21, 36 



Stephensia bovibycina Hk. non Tul., Proc. Cal. Acad. Sci., 3d ser., vol. 1, 

 no. 8 (1899), p. 268, pi. XLIV, figs. 18a-18r. 



Ascocarp clay-yellow, subglobose, compact, without mycelial tuft 

 at base, 1.5 cm. in diam., lobed, lobes minutely and deeply wrinkled, 

 cortex occasionally extending so deeply into interior as almost to reach 

 opposite side ; surface minutely scabrous ; gleba composed of very 

 small, irregular folds, sometimes joined, forming complex system of 

 narrow branching veins separating long, labyrinthine, more or less 

 connected canals and chambers not opening externally, lined with 

 hymenium formed of regular palisade of asci ; outer cortical tissue 

 pseudoparenchymatous, becoming hyphal within ; veins hyphal, orig- 

 inating from inner cortical tissue ; asci cylindrical, 8-spored, 12 by 

 40/a; globose-ellipsoid, regular in size, 10-11 by 12-1 3/^, very minutely 

 papillose. 



"Found in forests, March. No locality." No. 173, Hk. Col. Type. 



This species is found in the Harkness collection under the number 

 referred by Harkness to Stephensia hombycina (1899, p. 268). It will 

 be seen from the preceding description, however, that it differs from 

 Stephensia, as described, in the absence of venae externae ; of regular, 

 radial arrangement of the venae internae ; of a basal cavity ; and of 

 smooth, globose spores. 



Delastria Tul. 



Ascocarp irregularly subglobose, sometimes lobed, scabrous or 

 fineh' fioccose ; cortex distinct, extending into gleba as venae internae ; 

 latter anastomosing in reticulate form, separating gleba into rounded, 

 hymenium-bearing areas ; venae externae wanting ; asci irregularly 

 arranged in hymenial areas, often deformed, club-shaped or long ellip- 

 soid, sometimes curved, 2- to 4-spored; spores globose, alveolate, with 

 angles extended to form spines. 



This genus differs from Tuber in its lack of venae externae and in 

 the reticulate arrangement of the venae internae, forming well-marked 

 rounded areas of hymenium. The first suggestion of such arrange- 

 ment is found in Heterogenea of the genus Genea. Here the hymen- 

 ium, which in Ilydnocystis and Eugenea consists of an even uninter- 

 rupted layer of asci and paraphyses, is separated by strands of sterile 

 tissue into distinct "pockets," in which, because of the rounded 

 angles, the originally regularly placed asci and paraphyses become 

 irregular and crowded. In Genea cerebri formis extreme lobing of the 



