(Vol. 7 

 230 ANNALS OF THE MISSOURI BOTANICAL GARDEN 



becoming confluent, sometimes with margin barely free, rarely 

 distinctly reflexed, with the upper surface tomentose, light buff 

 to pinkish buff, the margin entire; hymenium even, cracking in 

 a tessellated manner, not shining, light vinaceous purple when 

 young, gradually changing to avellaneous when mature; in 



structure 250-300 /x thick, composed 

 of somewhat longitudinally and 

 loosely interwoven, hyaline, thin- 

 walled, nodose-septate hyphae 2-3 

 fx in diameter, not differentiated into 

 an intermediate layer with a dark 

 or dense bordering zone; hymenial 

 layer simple when young, with very 

 numerous and conspicuous, filiform 

 Fig. 48. s. roseo-carneum. Par- paraphyses, colored above and with 



aphyses of type p; paraphyses, j/, short . branched tips or bearing short 

 of collection at Ithaca, and spores, ^ 



s, all x 665. lateral prongs on from 5-20 /i of the 



outer portion of the paraphysis, the 

 paraphyses less conspicuous when basidia appear ; spores white 

 in spore collection, even, flattened on one side, 6-9X4-5 /*, 

 borne 4 to a basidium on simple basidia. 



At first forming little fructifications 3-5 X 2 mm., which become 

 confluent over areas up to 6 X 1^ cm. ; margin becoming free or 

 reflexed for 1-3 mm. 



On fallen limbs of frondose species. Canada to North Caro- 

 lina and westward to Wisconsin, and in Brazil and Japan. 



Since S. roseo-carneum is nearly always resupinate and does 

 not show in sectional preparations of such specimens a distinct 

 intermediate layer, its inclusion in the genus Stereum must 

 trouble beginners. Fortunately it is a species so unique in 

 structure that it may be determined with confidence. Most 

 collections are likely to show more or less of the fuscous-lilac 

 color, which is intense in young stages; the hymenium cracks 

 and has the aspect of Corticium evolvens in other features than 

 color, although of different structure; sections of S. roseo- 

 carneum show in the hymenial surface filiform paraphyses 

 branched above, as shown in the text figure. Such paraphyses 

 are present in only one of our Corticiums Corticium roseum. 

 It is regrettable that the Schweinitz type was relabeled by Dr. 



