1916] Gilkey: A Revision of the Tuheralcs of California 329 



"Under Pin us radiaia, in hard soil, about one-half exposed; U. C. 

 Campus, Berkeley, Calif., Apr. 27, 1!J03." 



No. 126, U. C. Col. Type. N. L. Gardner. 

 "Under Pinus radiata, U. C. Campus, Berkeley, Calif., May 24, 1903." 



No. 152, U. C. Col. N. L. Gardner. 



^Material umler No. 126 was sent to Fischer, who described and 

 figured it witliout a name in the Botanisehe Zeiiung (1908). This 

 species differs from Piersonia alveolata Ilk. in the smaller hymenial 

 areas with thicker stei-ile structure between, somewhat smaller asci 

 Ayith fewer spores, nnicli greater size of the ascocarp, and probably in 

 the yery long winding canals through the gleba, though the failure to 

 secure perfect sections of P. alveolata leaves this point somewhat 

 doubtful. The gleba, in cut surface, instead of appearing yeined with 

 large hymenial areas lying between, as in P. alveolata, presents the 

 appearance of a compact structure occasionally interrupted by com- 

 paratiyely small ascus-bearing areas. The sterile tissue in places be- 

 comes narrow enough to be considered veins, but generally is wider 

 than the fruiting tissue. The orange-colored dots described by Hark- 

 ness in P. alveolata are absent in P. hispora. Since the "dots" are 

 merely the "nests" of asci, the color being due to the crowded masses 

 of spores, this difference in the two species can be explained by the 

 smaller ascus-bearing areas with consequently fewer asci, and by the 

 smaller number of spores maturing in an ascus, making the whole mass 

 of spores much less conspicuous. 



Through the long venae externae, the paraphyses which line the 

 walls are found to be quite regularly fascicled, and what appear to 

 be undeveloped asci are occasionally found. The explanation, then, 

 of tlie peculiar grouping of the asci in distinct areas within the asco- 

 carj), may be simply the loss of asci from the walls of the original folds, 

 and the closing togethei' of these walls to form narrow canals. 



Geopora Ilk. 



Ascocarp tomentose, iri-egular in shape, varying from simply lobed 

 to very complexly folded, folds loose and easily sepai'able oi- more oi' 

 less united ; inner cavity originally single, but divided by infolding of 

 wall or by projections from inner surface into narrow labyi'inthine 

 canals, contiinious oi" partitioned into chambers by uniting of folds; 

 asci and parai)hyses arranged in palisade on inner side of folds, 

 hymenium rarely opening to exterior of folds or ascocarp ; asci cylin- 

 drical to clul)-shaped ; spores ellipsoid, smooth, colorless, 1- oi- incom- 

 pletely 2-sei-iate. 



