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[Vol. 13 

 196 ANNALS OF THE MISSOURI BOTANICAL GARDEN 



14. C. crustaceum (Karsten) v. Hohnel & Litschauer, K. 

 Akad. Wiss. Wien Sitzungsber. 115: 1566. 1906. 



Xerocarpus crustaceus Karsten, Hedwigia 35: 45. 1896. 

 Stereum crustaceum Karsten in Sacc. Syll. Fung. 14: 215. 1899. 



Type: in Karsten Herb, and Burt Herb. 



Fructifications effused, thin, crustaceous-adnate, somewhat 

 grumose, not at all separable, white or whitish, even or somewhat 

 granular, conforming to inequalities of the substratum, somewhat 

 cracked; in section 40-100 y. thick, not colored, composed of 

 densely arranged hyphae 2 p. in diameter, not well shown, with 

 crystalline masses intermixed; no gloeocystidia; spores hyaline, 

 even, 4J-5 X 3 |x, copious. 



Fructifications 2-6 cm. long, 1-3 cm. wide. 



On rough bark of Acer, Crataegus, Populus, Salix, Ulmus, and 

 Abies. Finland and Canada to Florida. July to November. 

 Probably common. 



C. crustaceum is so similar in aspect to Peniophora Sambuci that 

 it is necessary to distinguish it from the latter by the microscopic 

 characters of sectional preparations. C. crustaceum has no 

 cystidia, has more densely arranged hyphae and a good deal of 

 obscuring crystalline matter intermixed. 



Specimens examined: 

 Finland : Mustiala, P. A. Karsten, authentic specimen on Populus. 

 Canada: J. Macoun, 1, 2; St. Lawrence Valley, J. Macoun, 27, 



49, 51. 

 Ontario: Ottawa, J. Macoun (in N. Y. State Mus. Herb., and Mo. 



Bot. Gard. Herb., 55902), and 4. 

 Quebec: Hull, J. Macoun, 82. 

 Vermont: Middlebury, E. A. Burt. 

 West Virginia: Paw Paw, C. L. Shear, 1176. 

 Florida: Jacksonville, W. W. Calkins, comm. by Farlow Herb, (in 



Mo. Bot. Gard. Herb., 44637). 



15. C. pelliculare Karsten, Finska Vet.-Soc. Bidrag Natur och 

 Folk 48: 411. 1889; Hedwigia 35: 46. 1896; Sacc. Syll. Fung. 

 9: 232. 1891; Bourdot & Galzin, Soc. Myc. Fr. Bui. 27: 239. 

 1911. Cf. v. Hohnel & Litschauer, K. Akad. Wiss. Wien Sitz- 

 ungsber. 115: 1556. 1906. 



