670 THE AGARICACEAE OF MICHIGAN 



This description was taken from Peck's Report. It is submitted, 

 so that more data may be obtained on the relation of this and the 

 preceding species. Patouillard's figure of P. petal o ides var. lobatus 

 (Tab. Analyt, No. 421) may be this species, as he figures the spores 

 elliptical-ovate. Hard gives the spore measurements elliptical, al- 

 though he says "globose." His figure could be either species. 

 Galtfelter (Trans. St. Louis Acad, of Sci., Vol. XVI, No. 4, p. 44) 

 gives the spores of P. petaloides as 3-4 inicr., and globose. There is 

 thus considerable discrepancy between European and American 

 notices of P. petaloides, so that Peck appears justified in separat- 

 ing the one with globose spores from the one with elliptical spores. 

 It is more than likely, however, that American authors have con- 

 fused Pamis angustatus Berk, with P. petaloides in which case P. 

 spathulatus would revert to P. petaloides as a variety, just as Fries 

 placed it, and the elliptical spores would belong to P. petaloides as 

 in Europe. All these species are doubtless edible so that the my- 

 cophagist is unaffected by the situation. Both Partus angustatus 

 and Pleurotus petaloides have abundant cystidia, and both have 

 been found in northern Michigan. 



709. Pleurotus candidissimus B. & C. 

 Ann. Nat. History, 1859. 



PILEUS 2-18 mm. broad, flaccid, reniform or dimidiate, soft-mem- 

 bianous, # ascending, convex then plane, attached laterally, never 

 resupinate, subsessile i. e. stem very short, sometimes sessile, pure 

 white, pulverulent, with a chalky lustre, villose at point of attach- 

 ment, margin sulfate, varying to rugose-striate. GILLS radiating, 

 decurrent, subdi^tant to distant, broader in front, narrowed to the 

 villose base, thin, white. SPORES globose, 4-6 micr. diain., smooth. 



Gregarious, on rotten wood. Mixed hemlock, maple and beech 

 woods. Houghton, Bay View, New Richmond. July to September. 

 Infrequent. 



Tli is little species is easily mistaken for P. septicus from which 

 it differs in its globose spores and its sulcate and non-resupinate 

 pileus. The pileus may become resupinate on drying or when old. 

 It varies from sulcate to obscurely striate or lacimose-rugose, but 

 \ igorous specimens show this character well. Other Friesian species 

 differ as follows : P. mitis has an even pileus ; P. limpidus is hygroph- 

 anous and the gills are crowded and linear; and P. acerosus has 



