28 
MUCRONOPORUS E. & E. 
A NEW GENUS OF POPOLYPORE.E. 
Iii examining some specimens of Polyporus in our herbarium we find 
several species having the inner surface of the pores studded with red¬ 
dish-brown spines exactly as in the hymenium of Hymenochcete. The 
only described species having this character, so far as we know, is Poly - 
stictus balansw , Speg.,of which Saccardo(iu Sy 11.) remarks that it might 
well be the type of a new genus (“facile novum genus”). And in fact 
it is just as reasonable to separate the spiny-pores species under a new 
generic name as to separate Hymenochcete from iStereum. We therefore 
here propose to separate these species, which are mostly of the genus 
Polystictus , under the generic name of Mucronoporus (Mucro and porus.) 
Mucronoporus circinatus, (Fr.). Fine specimens of This species 
were found some years ago at Newfield, N. J., among the decaying 
roots of an old cedar stump. Spines abundaut, more or less curved, 
60-75 by 8-10//. 
Mucronoporus dualis, (Pk.) (specimen from Peck.) has the same 
hooked spines as the preceding, and is probably a form of that species. 
Mucronoporus tomentosus, (Fr.). Specimens collected by Dr. J. 
Macoun on Prince Edward Island. Spines very distinct, ovate lanceo¬ 
late at first, finally more slender 35-70 by 12-20/1. 
On account of the spiny hymenium we at first supposed this to be a 
new species, but authentic specimens of Pol. tomentosus from Finland (ex 
Herb. Karsten) have the hymenium of the same character, and there can 
be no doubt that the Prince Edward Island specimens are that species. 
A drawing has been made of one of these specimens, and we add a brief 
description. 
Centrally stipitate. Pileus orbicular, 6-12 cm across, thin, strongly de¬ 
pressed in the center, light dirty yellow, innate tomentose, mostly zone¬ 
less, but sometimes indistinctly zonate, margin paler. Flesh of pileus 
light yellow, of fibrous texture about 2 mm thick, subcoriaceous. Pores 
of medium size, about 2 wm deep, round or sub-angular, some of them 
compound, i. e ., divided below by partial dissepiments, margins thin, 
whitish, and sub-lacerate, umber color within. Stipe 1-3 by J-l cm 
spongy, cinnamon color, minutely tomentose. The general appearance 
is that of P. perennis , but the pileus is of a brighter yellow and more 
distinctly tomentose, and the inner surface of the pores is studded with 
reddish brown ovate conical bodies 35-75 by 12-30//, apparently of the 
same character as the bristles in Hymenochcete , only stouter. Plate vm, 
figs. 1 and 2, show the upper and lower surface of the pileus. Fig. 3, 
section of pores, showing the projecting points or spines. Fig. 4, one of 
these spines magnified. Fig. 5, spine with a bifid tip. 
Mucronoporus gilvus, (Schw.). In all the specimens of this 
species the spines are present but not abundant. They project 15-20// 
and are about 4-5// thick at the base. 
