1920] 



BURT — THELEPHORACEAE OF NORTH AMERICA. XII 



217 





Fig. 42. jS. albobadium. Section 

 X 90; cystidium, c, paraphyses, p, 

 and spores, s, X 665. 



becoming confluent, sometimes becoming narrowly reflexed, 

 with the upper surface villose, varying from buffy brown to 

 Natal-brown, becoming somewhat zonate when reflexed about 

 5 mm., the margin entire and 

 usually whitish ; hymenium even, 

 somewhat velvety, bister or snuff- 

 brown, becoming light drab and 

 somewhat pruinose with age; in 

 structure about 500 /x thick, the 

 intermediate layer with a darker 

 zone on its upper side and com- 

 posed of loosely, longitudinally 

 arranged, slightly colored hyphae 

 3-3^ M in diameter; hymenium 

 30-45 /x thick, not zonate, having 



incrusted cystidia 30-45X8-15 fx all confined to the single- 

 layered hymenium, protruding up to 25 m; branched, filiform 

 paraphyses 2 ju in diameter, becoming colored, are present also 

 in the hymenium, basidia simple, 4-spored; spores white in 

 spore collection, even, flattened on one side, 6-11 X3-4| m- 



Fructifications 5-10 mm. in diameter, becoming confluent 

 over areas 1-2 cm. wide and 3 to many cm. long, and reflexed 

 2-5 mm. 



On dead frondose wood and fallen limbs. New York to 

 Mexico and westward to Idaho and Arizona, in the West Indies, 

 and reported from Brazil. Throughout the year. Common. 



S. alhohadium may usually be recognized by its brown, velvety 

 hymenium wdth a white border; with age the hymenium tends 

 to become more uniformly light drab or pruinose, but some 

 small fructifications in the vicinity are likely to show the original 

 color contrasts. This species has a wide geographic range and is 

 somewhat variable in coloration but is very constant in micro- 

 scopic structure; the branched, colored paraphyses are highly 

 distinctive. 



Specimens examined: 

 Exsiccati: Bartholomew, Fungi Col., 3688, 4784; Ellis, N. Am. 

 Fungi, 15; Ravenel, Fungi Am., 221, 449; Ravenel, Fungi 

 Car. i:29. 

 New York: Grand View, H. von Schrenk (in Mo. Bot. Gard. 



