(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 

 3"oung, gradually changing to avellaneous when mature; in 



structure 250-300 ^ thick, composed 



,,, ^ , of somewhat longitudinally and 



f ¥ ^l "^^'O n loosely interwoven, hyaline, thin- 



jf // y \l if ^ Q walled, nodose-septate hyphae 2|-3 



ji, II /I II \^\.^ ij ^ in diameter, not differentiated into 



"%=& ^J'-Af V-V-^l ^-■' ^^ intermediate layer with a dark 



\ f[ I ^Y \f or dense bordering zone; hymenial 



'/ z, i' I jj II layer simple when young, with very 



numerous and conspicuous, filiform 

 Fig. 48. 5. roseo-carneum. Par- paraphyses, colored above and with 



aphyses of type, p; paraphyses, p', ij.u i„j4-- i, • i,j. 



r 11 ^- /t^u a short-branched tips or bearmg short 



oi collection at Ithaca, and spores, ^ ® 



s, all X 665. lateral prongs on from 5-20 /x 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 Mj 

 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 6X1^ 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 wdth 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. 



