[Vol. 12 

 320 ANNALS OF THE MISSOURI BOTANICAL GARDEN 



91. P. filamentosa (Berk. & Curtis) Burt in Coker, Elisha 

 Mitchell Scientif. Soc. Jour. 36: 162. pi. 32, f. 6, 6. 1921. 



Corticium filamentosum Berkeley & Curtis, Grevillea 1 : 178. 

 1873; Sacc. Syll. Fung. 6: 619. 1888; Massee, Linn. Soc. Bot. 

 Jour. 27: 154. 1890. — (In part) Corticium Petersii Berkeley & 

 Curtis, Grevillea 1: 177. 1873. — Peniophora unicolor Peck, 

 N. Y. State Mus. Rept. 43: 66. 1890; Sacc. Syll. Fung. 9: 

 239. 1891. — An Corticium radicatum P. Hennings, Pilze Ostaf- 

 rikas, 54. 1895; Sacc. Syll. Fung. 14: 222. 1899? See v. 

 Hohnel & Litschauer, K. Akad. Wiss. Wien Sitzungsber. 117: 

 1093. 1908. 



Type: in Kew Herb, and Curtis Herb. 



Fructifications broadly effused, membranaceous, loosely ad- 

 nata, separable when moistened, soft, drying Isabella color to 

 buffy citrine, the margin and subiculum concolorous with, or a 

 little paler than, the hymenium, often extended into, or con- 

 nected with, branching mycelial strands or cords; in section 

 150-400 (JL thick, colored, with the hyphae loosely interwoven, 

 thin-walled, 3-4 (x in diameter, densely incrusted with ochraceous 

 granules which are not soluble in lactic acid preparations, but 

 dissolve quickly when sections are treated with potassium hydrate 

 solution and leave the sections bleached, after first becoming 

 vinaceous; cystidia incrusted, 40-50 x 6-8 ;jl, protruding up to 

 40 (X, confined to the hymenial layer; spores white in spore col- 

 lection, even, 3-5 x 2-3 (x. 



Fructifications 2-10 cm. long, 1-3 cm. broad; sometimes much 

 larger on logs by confluence longitudinally. 



On decaying wood and logs and fallen limbs of frondose species. 

 Germany, Canada to Alabama, and westward to Arizona, in 

 Mexico, the West Indies, and Japan. July to January. Com- 

 mon. 



Although colored like a Coniophora, P. filamentosa is easily 

 recognized by its marginal mycelial strands, small and white 

 spores, and hyphae incrusted with ochraceous granules which are 

 soluble in the 7 per cent solution of potassium hydrate with 

 which sections are usually treated. Since the original description 

 of Corticium Petersii combines the characters of both Peniophora 

 sanguinea and P. filamentosa, and one of the types is of one species 



