Murrill, W.A. 1904: The Polyporaceae of North America - VII. The genera Hexagona, Grifola, Romellia, Coltricia and Coltriciella. Bulletin of the Torrey Botanical Club 31: 325-348.
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| Murrill, W.A. 1904: The Polyporaceae of North America - VII. The genera Hexagona, Grifola, Romellia, Coltricia and Coltriciella. Bulletin of the Torrey Botanical Club 31: 325-348. |