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Page number:73 
Description type:Culture description 
Description:Poria xantha (Fr.) Cke., Grevillea 14: 112. 1886.
Polyporus xanthus Fr., Hym. Eur., p. 574. 1874.
Description of cultures
Key Pattern. B-O-I-1-2-10-16, B-O-M-1-2-10-16, A-O-I-1-2-10-16, A-0-M-1-2-10-16.
Cultural characteristics of Poria xantha have been published by Badcock (1), Cartwright and Findlay (9), Davidson and Campbell (10), Humphrey and Siggers (13), Nobles (18, 19, 20), Puri (22), and Vanin (26) and will not be redescribed here.
In addition to those listed in table I, 24 isolates were available for this reexamination of the species. Four of these were associated with basidiocarps and 20 of them were from various products, including boats, houses, utility poles, stakes in open ground tests, etc. The hosts represented by these isolates were species of Pinus, Pseudotsuga, Quercus, Tsuga, and unidentified conifers. They were collected in the following localities: N. Y., N. J., Pa., Md., Va., Fla., Wisc., N. Mex., Ariz., Calif., Oreg., and Wash. An isolate from Agathis, received from New Zealand, was studied also.
The "key pattern" is being revised herein from that previously published by the Forest Disease Laboratory (10) in order to give more prominence to the presence of hyphae with irregularly thickened walls as a diagnostic character (No. 16 in the "key pattern"). These thickwalled hyphae are frequently broken at a place where one or more simple enlarged clamps are so close together as to appear to be double or multiple and are conspicuous when seen in the mounts. Few to many chlamydospores with medium thick walls are also present in 14-day-old cultures. Isolates of P. xantha are rather readily recognized by the distinctive creamy-white to light-buff color of the thin downy-cottony mats, which form occasionally a soft roll of mycelium against the sides of the dish by 14 days of age. The mats of older dishes occasionally develop thin white to pale yellow fruiting areas with minute pores. The cultures give negative oxidase reactions to the Bavendamm and gum guaiac tests.
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