. Bulletin. Natural history; Natural history. Fig. .A stroma of Dolhiorella. The black stromatic tissue and pycnidial cavities that contain spores are shown in vertical section. X ,S0. J. Fig. 5.—Spores of Dolhiorella. I'he spores .irc continuous, hyaline and ovoid. X 300. daily diameter growth of mm. Germ tubes reach a length of approximately 188 /I before any branching occurs. Cultures of Dotliiorella grown from ^iIlgle-spore isolations failed to produce fructifications on artificial media or on sterilized wood of white oak. However, fructifications of Dolhiorella developed on the na
. Bulletin. Natural history; Natural history. Fig. .A stroma of Dolhiorella. The black stromatic tissue and pycnidial cavities that contain spores are shown in vertical section. X ,S0. J. Fig. 5.—Spores of Dolhiorella. I'he spores .irc continuous, hyaline and ovoid. X 300. daily diameter growth of mm. Germ tubes reach a length of approximately 188 /I before any branching occurs. Cultures of Dotliiorella grown from ^iIlgle-spore isolations failed to produce fructifications on artificial media or on sterilized wood of white oak. However, fructifications of Dolhiorella developed on the naturally infected wood pieces that w ere placed on corn meal agar. Fig. 6.—Culture of Dolhiorella. On corn meal agar, this fungus produced gray to tan mycelium without stromata. from pin oak: two from blighted petioles of two separate specimens and one from a twig. In the above cultures the fructifica- tions varied from a pycnidium with one chamber to compound p\cnidia in a stroma. The fructifications are black, ovoid, ostio- late, pseudoparenchymatous, and 260-530 /I in diameter. They contain conidia that are 18-25 X 12-17 fx, hyaline, ovoid and continuous. The conidiophores are hya- line, 12-16 X jx, papillate and un- hranched. Microscopic examination did not reveal the presence of fungous hyphae in the dis- colored regions of the x\ lem, fig. 3. Many of the trachea and parenchyma cells ap- peared to be partially filled with a granular material, and many of the cell walls were dark and evidently were not stained. The Dolhiorella described in this paper was previously called Phoinaehora by Car- ter (1938). Our material agrees with Dolhiorella querciria (Cke. & Ell.) Sacc. as represented in Shear's New \'ork Fungi No. 373. Other fungous cultures from 135 speci- mens of diseased oak appeared to be iden- tical with Dolhiorella in every respect ex-. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readabi
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