1916] Gilkey: A Revision of the Tuherales of California 339 



ascocai-p causes more or less doubling of the hymeniuin, further com- 

 plicating the arrangement, the highest development of Avhich is per- 

 haps found in Dclastria. The spores of Delastria, with the sharply 

 projecting angles of the alveoli, resemble somewhat those of Hydno- 

 holitcs, but the two genera are easily separated by the absence and 

 presence, respectively, of venae externae, and by the general char- 

 acters of the ascocarp. 



Delastria rosea Tul. 



Tulasne, Ann. Sc. Nat., 2nd ser., vol. 19 (1843), p. 379. 



Ascocarp 1-1.5 cm. in diam., subglobose, somewhat convolute, sur- 

 face minutely scabrous, caused by irregularl}^ projecting cortical cells ; 

 veins of gleba indistinct like water marks, dividing it into roundish 

 areas ; cortex hyphal to pseudoparenchymatous, compact, 80/a thick ; 

 sterile veins of irregular hyphae joined to form pseudoparenchymatous 

 structure ; cells sometimes reaching width of 20ft ; asci semi-globose, 

 36-52 by 48-60/*, or very much elongated, reaching length of 120/a, 

 width 40/t ; spores globose, 22-30/i., alveolate and spiny, 2-7 alveoli 

 across surface, spines somewhat blunt, thick, 5ft in height. 



"Under shrubs among vegetable humus. Auburn, Placer Co., Calif., 

 May." No. 182, Hk. Col. 



While for this genus only one species is reported, a great amount 

 of variation apparently exists. Fischer's illustration (1897a, p. 317) 

 represents a plant whose veins are principally hyphal, whose spores 

 have generally 6-7 alveoli across the diameter, the angles projecting as 

 sharp-pointed needles, and whose cortex is more or less pseudoparen- 

 chymatous of somewhat elongated narrow cells. The spore diameter 

 cited is 30-40/x. Tulasne s illustration (1851, pi. XVI, tig. 1) indi- 

 cates, on the other hand, a nuieh looser, irregular structure through 

 the venae internae, which is also seen in an Italian specimen, in the 

 University of California herbarium, from Mattirolo. The spores of 

 the latter agree in size with the measui-ements given by Tulasne and 

 Fischer (30-40/x). Our specimens have a compact structure through 

 the cortex and outer veins similar to that of P^ischer's figure, though 

 the hyphae in ours are entirely unconnected through the cortex, be- 

 coming more or less united in llie venae internae, in places even 

 pseudoparenchymatous witli large cells. The spores in ours, how- 

 ever, are smaller than of any of the above, measuring 22-30ft, and the 

 number of alveoli across the diameter is niore often 3-5 than more, 

 though occasionally 7 are found. Tlie spines are distinct (they are 



