50 



Mycologia 



" P. xantholoma, Schw. Widely effused, closely adnate, even, 

 smooth, dry ; the border rather broad, velvety, yellowish. Pores 

 minute, unequal, subrotund, obtuse, pale yellowish. 



" Common in woods. Effused often to the extent of many 

 inches or even several feet on the underside of sticks or smaller 

 branches lying somewhat up from the ground and keeping dry. 

 The border is sometimes ' elegantly luteous ' and therefore of a 

 deeper yellow than the pores but this is not always the case. The 

 pores at first are pale, maturing into a rich cream-color ; they are 

 mostly roundish but vary to oblong and subsinuous ; the dissepi- 

 ments are thick and obtuse; they average .16 mm. in diameter. " 



A more complete description accompanies a collection made by 

 Overholts on elm logs in Ohio in 191 1, which includes both young 

 and old stages : 



" Effused, irregular, firm and rigid, perennial, 6-8 mm. thick ; 

 margin thin, narrow, adnate, tomentose ; hymenium plane or con- 

 vex, even, white, pallid or yellowish in old specimens, with a slight 

 silky sheen on some specimens ; mouths circular, thick-walled, 

 entire ; tubes 1-2 mm. long each season, white within ; spores 

 elliptical, smooth, hyaline, 4.5-5.5 X 2.7-4.5 



Allowance must always be made for weathering, exposure to 

 light, obliquity of tubes, condition and character of substratum, 

 etc. If one finds a conspicuous species of Poria on an old, ex- 

 posed, decorticated locust or chestnut post, it is pretty apt to be 

 this species, which is by no means choice but is very common and 

 widely distributed in America on dead wood of oak, chestnut, 

 black locust, poplar, beech, witch hazel, dogwood, sassafras, 

 maple, mulberry, elm, tulip, ash, and probably other deciduous 

 trees. P. albo-incarnatus Pat. & Gaill., from Venezuela, and P. 

 vitellinulus P. Karst., from Finland on alder, do not appear to be 

 distinct. Among the great number of collections examined, the 

 following will serve to indicate its distribution in this country. 



Ellis &Ev. N.Am. Fungi 503, 3409; Ellis &Ev. Fungi Columb. 

 402; Rav. Fungi Car. 3: 1.2; Canada, Dearness, Macoun 151; 

 Rocky Mountains, Macoun 532; Maine, Murrill 1/8/; New 

 Hampshire, P. Wilson; Connecticut, Underwood; New York, 

 Atkinson (Cornell Univ. Herb. 8254, 8279), Brown 135, Dodge. & 

 Seaver, Fairman, Livingston & Crane, Murrill 2709, Underwood 

 308, P. Wilson; New Jersey, Ellis 3844, P. Wilson; Pennsylvania, 

 Banker, Haines & Everhart, Jackson 25, Murrill 1020, 1045, 10 7°> 



