MURRILL : POLYPORACEAE OF NORTH AMERICA 85 



i. Agaricus quercinus L. 



Agaricus quercinus L. Sp. PI. 1176. 1753. — Sow. Engl. Fung. //. 



1S1. 

 Agaricus labyrinthiformis Bull. Herb. Fr. pi. 352. 1787. 

 Dacdalca quercina Pers. Syn. 500. 1S01. 

 Polyporus latissimus Fr. Obs. I : 128. 181 5. 

 Dacdalca quercina var. nigricans Fr. Syst. I : 333. 1821. 



This very common species has been known from ancient times 

 on account of its size and abundance and because it grows on 

 stumps and timbers in conspicuous places. The abundant use of 

 oak, its favorite host, brings it to the attention of many. Bauhin 

 and other prelinnaean botanists seem to have been impressed with 

 the striking appearance of its hymenium, expressed by Linnaeus in 

 his " Agaricus acaulis, lamellis labyrinthiformibus " and by Bulliard 

 in his choice of a specific name. The figure on Batarra's plate 

 38 is a rather old blackened form of this species, distinguished by 

 him as a variety and cited by Fries as var. nigricans. Polyporus 

 latissimus was described by Fries from resupinate forms frequent 

 on structural oak timbers before he was well acquainted with the 

 variations of the species. As this species is so extremely common 

 and well-known, it is not considered necessary to give a list of 

 available collections. All the exsiccati contain specimens of it, 

 and one can hardly fail to find it at any season of the year on some 

 oak stump or decaying trunk. 



2. Agaricus juniperinus sp. nov. 



Sporophore corky, sessile, attached by a broad, often decur- 

 rent, base, composed of imbricate, terraced or laterally connate, 

 ungulate pilei 2-5 x 2-7 x 1.5-3 cm -i surface irregular, anoderm, 

 finely tomentose, yellowish-white, becoming cinereous with age ; 

 marginal edge fertile, concolorous, not rounded, but often forming 

 an obtuse angle : context corky, white, concentrically banded, 

 0.5—1 cm. thick; furrows large, labyrinthiform, radially, rarely 

 otherwise, elongated, 0.5-2 cm. long, 1-3 mm. wide, white or pal- 

 lid, edges obtuse, often splitting into broad irpiciform plates : spores 

 smooth, hyaline, ovoid, 3-4 X $— 6 fi. 



The type plants of this species were collected by Bartholomew 

 on a red cedar stump near Rockport, Kansas, November 8, 1894. 

 It was again collected bv Bartholomew on the same host but in a 



