91 
All these we are satisfied are the same, being at first of a yellowish 
cinnamon color, becoming darker (chestnut) and finally fading more or 
less, being made up of a thin (l-2 mm thick), continuous stratum of sub- 
equal, nearly round, pores connected at the base by a thin membrane 
and with a narrow sub-indefinite margin. The fungus often extends 
along the limb for 6 inches or more. The inner surface of the pores is 
constantly clothed with spines, but they are less abundant and mostly 
shorter (20-30/*) than in N. A. F., 111. There seems good reason to 
doubt whether this is the P. unitus Pers. It certainly does not agree 
with the figure in Fries leones which represents it as growing in definite, 
orbicular, or oblong patches, with a definite mar gin. P. unitus is also 
said to grow on wood of fir trees and to be 4-5 mm thick. We should 
rather refer the P. contiguus of Rav. Car. and the P. unitus of the u Flora 
of the Miami Valley” to P. floccosus, Fr., Hym. Eur., 572. The P. con¬ 
tiguus, Fr., in deThiimen’s Mycotheca, 1303, on wood of Picea vulgaris , 
collected in Finland by Karsten, has somewhat the same general ap¬ 
pearance, but is softer, has a more distinct margin, and is, as far as we 
can see, without spines. The Finland specimen certainly agrees better 
with the description of P. contiguus than any of the American specimens 
above mentioned, and is probably the species described by Fries. 
Mucronoporus obliquus, (Pers.). An authentic specimen from 
the herbarium of Fries and one from Dr. P. A. Karsten, Finland, have 
the hymenium very spiny. Spines at first ovate-conic, 8-12/*, soon 
elongated 15-30 by 6-8/*, some even 35-40/* long. The specimens in N. 
A. F. 313 are certainly not this species. The pores are smaller, color 
inclining more to yellow, and hymenium unarmed or with a very few 
short spines. There is hardly a doubt that this (N. A. F. 313) is a re- 
supinate form of Pomes igniarius , or in some copies (specimens decidedly 
yellow and spores ferruginous) of Pomes rimosus , (Berk.). 
Mucronoporus spissus,(Sc1iw.). Specimen irom Ohio (Morgan, 298) 
and from West Chester, Pa. (Everhart), both on hickory. Spines toler¬ 
ably abundant, 15-25 by 4-5/*. This is a very different thing from the P. 
spissus in Herb. Schw. which appears to be the same as P. salmoni color, 
B. & C. This species (P. spissus , Ohio and Pennsylvania specimens) 
originates beneath the bark, which is soon thrown off directly over it, 
leaving the surface of the pores lower than that of the bark. The thin, 
narrow margin is closely attached to the broken margin of the surround¬ 
ing bark, so as generally to be turned up perpendicularly, but is not prop¬ 
erly incurved, though in old specimens after the surrounding bark has 
fallen away it may have something of that appearance. Whether it is 
the species described by Schweinitz may perhaps be doubted. 
Mucronoporus igniarius, (L.). Finland species from Karsten 
agree with those in de Thiimens Austrian Fungi Nos. 714 and 1007 and 
Mycotheca Marchiea 1504. Spines not abundant, 8-20 by 5-0/*. In 
poorly developed specimens and resupinate forms of this species the 
spines are either entirely wanting or very scarce, The specimens in NT. A. 
