TWO NEW TRUFFLES 



Helen M. Gilkey 



Tuber canaliculatum sp. nov. 



Tuber Borchii Kauffman non Vittad. Rep. Mich. Acad. Sci. 

 12 : 216. 1910. 



Ascocarp brown, surface conspicuously covered with small, 

 low, polygonal papillae ; veins conspicuous, whitish ; cortex 

 pseudoparenchymatous with outermost cells sometimes arranged 

 in hyphae more or less parallel with surface of ascocarp, some- 

 times projecting beyond surface as hairs ; pseudaparenchymatous 

 layer changing to somewhat irregularly arranged coalescent hy- 

 phae, becoming less connected toward hymenium; thickness of 

 peridium 360-520 /x; venae internae small and inconspicuous to 

 almost wanting, consisting of unconnected somewhat irregularly 

 arranged hyphae, latter 4-6 /x in diam. ; tissue between asci of 

 similar structure, but hyphae bordering venae externae becoming 

 distinctly parallel, some ending at margin of vein as more or less 

 regularly arranged, somewhat swollen-tipped paraphyses, others 

 continuing inward to form loose, interwoven tissue filling venae 

 externae; latter much enlarged in places, and hyphal tissue of 

 narrower portions often breaking away, leaving empty channels 

 through ascocarp ; asci short-stipitate, semiglobose to cylindric, 

 "72-88 by 96-120 /x, 1-, 2-, or 3- (generally 2-) spored; spores 

 dark-brown, ellipsoid to nearly globose, 40-52 by 48-72 fi, alveo- 

 late, 4 by 5 to 7 by 8 alveoli across diameters ; sculpturing 4-6 p 

 thick. 



On sandy hillside of maple, oak, and hemlock, bordering a 

 cedar swamp. Allegan Co., Mich., Sept. 15. No. 339, U. C. 

 Coll. Mrs. C. H. Kauffman. 



This species, which was sent to the University of California 

 herbarium by Professor C. H. Kauffman of the University of 

 Michigan, was published under the name of T. Borchii in the 

 12th Report of the Michigan Academy of Sciences, 1910. The 

 material examined, however, does not have the smooth surface 

 of the latter as described by Vittadini (Mon. Tub., 1831) who 



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