REVISION OF THE Хоктн AMERICAN HYDNACEAE 131 
Plant pileate, sessile, consisting of many pilei, crowded, imbri- 
cate, confluent at the base, the whole mass arising from a single 
relatively small point of attachment 2 cm. wide and spreading out 
into a hemispherical mass 30 cm. in diameter; the pilei arranged 
in uniform horizontal layers smaller at the top and bottom and 
larger in the center, convexed to depressed, subdimidiate, 4-30 cm. 
wide, 2-20 cm. long, 1-3 cm. thick ; surface uneven, subrugose, 
floccose pubescent, azonate, white ; margin incurved, repand, ob- 
tuse, subfertile ; substance tough, fibrous, moist, obscurely zonate, 
white ; teeth terete to subangular, flexible, tough, somewhat brittle 
when dry, long, crowded, milk-white, becoming dus to reddish 
when dried, 15-17 mm. long, 0.5-1 mm. wide, I and 2 to one 
millimeter; spores smooth, oblong, Әмен абы hyaline, 
finely granular, 3-3.5 by 5-7 p. 
Нав.: On trunks of dead or dying dni emerging from knots, 
also on Nyssa, Acer, Ulmus. 
RawcEÉ: Canada, Dearness ; Massachusetts, Blake ; New York, 
Underwood ; New Jersey, Ellis ; Pennsylvania, Haines, Everhart, 
and /efferis; Ohio, Lloyd, Kellerman; Indiana, Underwood, 
Banker, Cole. 
Icow.: Fries, Icon. 2/ 9, ro. 
Exsicc.: Ellis, М. Am. Fung. 318; Ellis and Everhart, Fung. 
Columb. 304. 
The species resembles 5. pulcherrimum Berk. somewhat but is 
larger coarser and of tougher and dryer substance. It is chiefly 
northern in its distribution and may represent a northern type of 
the former species, The above description was made from a fresh 
plant of typical form. Тһе semiglobose form of the mass made 
up of horizontal pilei standing out at right angles to a vertical 
orbicular disk is a very characteristic form of the plant and is well 
shown in Fries’ figure, /ос. си. The disk is separable from the 
substratum, being permanently connected only by the small point 
at which the fungus emerges from the tree. As the mass becomes 
very large and heavy, sometimes weighing 27 pounds, it often 
breaks off from the trunk and falls. Some plants appear to grow 
more diffuse and lose the regular orbicular character. Such a one 
is shown in Atkinson's College Botany, 553. It seems possible 
that this may represent a different species or at least a variety but 
I have not seen a living plant of this type. Because of the im- 
mense size of this plant ordinary herbarium specimens are mere 
