(Vol. 12 

 316 ANNALS OF THE MISSOURI BOTANICAL GARDEN 



Vet.-Soc. Bidrag Natur och Folk 51: 226. 1892; Sacc. Syll. 

 Fung. 9: 234. 1891; v. Hohnel & Litschauer, K. Akad. Wiss. 

 Wien Sitzungsber. 115: 1556. 1906 — (In part) Gloeocystidium 

 praetermissum (Karst.) v. Hohnel & Litschauer, K. Akad. Wiss. 

 Wien Sitzungsber. 115: 1565. 1906. — An Peniophora praeter- 

 missa Karsten, Finska Vet.-Soc. Bidrag Natur och Folk 48: 

 423. 1889? 



Type: probably in Karsten Herb, and fragment in Burt Herb. 



Fructifications long-effused, closely adnate, not separable 

 when moist, very thin, waxy, even, white or whitish, drying pale 

 pinkish buff to cream color, the margin thinning out; in section 

 60-150 iJL thick, not colored, with the hyphae 3-4 pi in diameter, 

 erect, branching, not incrusted, bearing the compact hymenium; 

 gloeocystidia numerous, variable in form, often tapering, 20-60 

 X 6-8 [l; cystidia hair-like, not incrusted, 4-5 |x in diameter, 

 protruding up to 20 [l beyond the basidia, few and scattered; 

 spores copious, hyaline, even, curved, 7-10 x 4-5 [x. 



Fructifications 2-10 cm. long, 1-2 cm. wide. 



On decaying coniferous wood. In Europe, in Canada to District 

 of Columbia, and in Oregon, Jamaica and Bermuda. July to 

 November. Rare in North America. 



The principal characteristics of P. pertenuis aiding in its recog- 

 nition are occurrence in thin, whitish, waxy fructifications on 

 old decaying coniferous wood, presence of gloeocystidia, and hair- 

 like non-incrusted cystidia which are not destroyed in any degree 

 by the treatment of the sections with potassium hydrate solution, 

 and the curved spores. P. tenuis differs in having its cystidia 

 incrusted at the tip. I have not seen an authentic specimen of 

 P. praetermissa but the specimen sent to me under this name by 

 Bresadola and one of the two specimens from Litschauer have 

 their cystidia almost completely disintegrated by the potassium 

 hydrate treatment in clearing and swelling the tissues of sections, 

 as occurs also in P. glebulosa. Hence, I think that P. praeter- 

 missa may eventually be regarded by European mycologists 

 as specifically distinct from P. pertenuis. 



Specimens examined: 

 Finland: Mustiala, P. A. Karsten, portion of type, comm. by 



Bresadola, also authentic specimen on Picea from Karsten. 



