[Vor. 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 y thick, composed 
os of somewhat longitudinally and 
Y Vis y Y ( On loosely interwoven, hyaline, thin- 
f PS lf "f. O walled, nodose-septate hyphae 21-3 
qu 4 Os y in diameter, not differentiated into 
J 4 de » an intermediate layer with a dark 
f | y i 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, P^ 5 ort-branched tips or bearing short 
of collection at Ithaca, and spores, 
s, all X 665. lateral prongs on from 5-20 y 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 y, 
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 6X 13 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 Sterewm 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. 
