1921] The Thelephoraceae of North Carolina 171 



3. Corticium scutellare B. & C. 



Plate 34 



Extensively effused on corticated or decorticated wood, cracked 

 into innumerable small areas, inseparable as a whole, but when dry 

 the upper, rather friable and chalky part is easily removed from a thin 

 white layer covering the wood; color varying from sordid white 

 through cream or clay to pallid yellowish or ochraceous; obscurely 

 nodulose; margin fading quickly out to a thin granular-looking edge, 

 not byssoid. Entire plant about 148-260[jl thick; hymenium about 

 65-7-5[jL, no cystidia. Clearing with potash shows a dark, dense 

 layer of about the same or greater thickness beneath the hymenium, 

 and a thinner, more delicate, pale layer next the wood; hyphae 

 delicate, 2.5-3.5ijl thick. 



Spores long-elliptic, 4 x 7.5-9.3[x. Basidia slender, long-clavate, 

 about 7.4[x thick, with four long sterigmata. 



This matches well with a collection from Bresadola so named 

 at the New York Botanical Garden, and agrees well with the original 

 description (Grevillea 2: 4. 1873). 



4043. On a very rotten but partly corticated branch of Aesculus octandra, Janu- 

 ary 21, 1920. 



4223. On bark of oak wood, March 27, 1920. Spores subelliptic, 4.4-5.1 X 9.3- 

 10m. 



4696. On bark of Hmb from a deciduous tree (birch or cherry), December 4, 1920. 

 Spores (print) subelliptic, some slightly curved at mucro end, hyaline, 

 3.7-4.5 X 7-9m. 

 Common on bark of limbs. Curtis. 



4. Corticium roseum Pers. 



Plate 33 



Plant effused, arising as small patches which fuse on meeting 

 without leaving a trace of the line of junction; margin definite and 

 at times a little uplifted, furnished with a very narrow white fringe 

 of fine fibers when growing; surface smooth, dull with the appear- 

 ance of fine felt, pale flesh color both when wet and dry, cracked 

 when dry, the cracks reaching nearly to the substratum, but usually 

 showing at the bottom the white fibers of the subiculum; 140-280^1 

 thick; threads of context not densely packed, 2.8-3.8[x thick, with 

 clamp connections. Hymenium dense, about 50[i thick, composed, 

 in addition to the basidia, of crowded, much-branched, more or less 

 contorted threads, the tips of which extend above the general sur- 

 face and help to give the pruinose appearance. 



