308 University of California Publications in Botany [Vol.6 



Hydnotrya cerebriformis Hk. 



Plate 30, fig. 27 



Proe. Cal. Acad. Sei., 3d ser., vol. 1, no. 8 (1899), p. 266, pi. XLIV, figs. 

 19a-19f. 



Ascoearp "salmon," 2.5 cm. in diam., subglobose, coarsely lobed, 

 with several deep, close folds ; snrf ace minutely villose ; gleba white 

 or yellowish, penetrated by long, labyrinthine, connected, narrow 

 canals, the walls lined with hymenium ; canals hollow but often so 

 narrow that tips of opposite rows of paraphyses are in contact ; outer 

 cortical tissue of tangled hyphae 10/a in thickness, with 3 or 4 terminal 

 cells of each projecting, swollen, reaching thickness of 20/x ; upon in- 

 folded surface these swollen hyphae larger, sometimes 36/x thick : 

 hyphae toward hymenium becoming more compact but conspicuously 

 tangled and interwoven ; hymenial tissue similar, bearing palisade-like 

 asci and paraphyses, latter a continuation of swollen hyphae of asco- 

 earp surface ; asci cylindrical, 8-spored, not constricted between spores, 

 rounded or slightly pointed at tips, 28 by 220;U. ; spores brown, globose, 

 25-32/A, minutely papillose ; paraphyses with terminal cell swollen, ] 2- 

 16/x thick, swollen tips projecting beyond asci in fan-shaped clusters. 



"Among fir trees, Donner Lake, Nevada Co., Calif., Julv." 



No. 37, Hk. Col. Type. 



While this species has very regularly cylindrical asci, conspicu- 

 ously swollen hyphae, and minutely papillose spores, all more or less 

 contrary to former descriptions of these parts in the genus Hydnotrya, 

 yet its general structure and its other characters come so near that it 

 seems best to refer it to this genus. With the addition of conspicu- 

 ously swollen paraphyses to the generic characters, this species can 

 be referred without difficulty to Hydnotrya as it is enlarged to include 

 H. ellipsospora. 



Only one specimen is found in the Harkness collection, and this has 

 been cut in two. The preceding description, with the exception of color, 

 has been made from the single plant. The color is quoted from Hark- 

 ness. A discrepancy is noted between his description of the spore 

 surface and that given above. This point is very difficult to determine, 

 for the sculpturing is exceedingly minute ; and very small regular 

 foveolate or alveolate markings and closely and regularly placed papil- 

 lae appear very similar under the microscope. However, from a study 

 of the margin of sectioned spores, and of surfaces which have been 

 separated from the body of the spore, it seems clear that the epispore 

 is pai)illose rather than foveolate. 



