192 THE AGARICACEAE OF MICHIGAN 



hyphae STEM 2-8 cm. long, 2-5 mm. thick, stuffed then usually 

 hollow, equal or tapering downward, white, glabrous. SPORES 

 broadly elliptical, smooth, 7-8x5-0 micr. CYSTIDIA none. 

 BASIDIA 40-45x5-6 micr., slender. ODOR none. 



Gregarious. On moist ground in low woods or on mosses in 

 swamps. Ann Arbor, New Richmond, Marquette. Throughout the 

 State. August- September. Infrequent. 



Most of our collections were composed of small plants, with 

 slender steins often only 2 mm. thick. The pileus varies from truly 

 convex to campanulate in the same patch. In some localities the 

 pileus was tinged a slight cream-color, but otherwise the plant was 

 the same. The umbilicus is sometimes obsolete. The pileus has a 

 thin subviscid pellicle. This species, with us, differs from H. 

 borealis in its more slender habit and its pileus, which is very thm 

 and umbilicate on the disk. It is rather tough, and when moist the 

 pileus is slightly viscid. 



171. Hygrophorus borealis Pk. (Edible) 

 N. Y. State Mus. Rep. 2G, 1874. 



PILEUS 1-3.5 cm. broad, convex then subexpanded, obtuse, moist, 

 glabrous, even, white. FLESH thickish on disk, thin elsewhere, 

 coneolor. GILLS decurrent, arcuate, distant, intervenose, white. 

 STEM slender, 2-5 cm. long, 2-5 mm. thick, firm, equal or tapering 

 downward, straight or flexuous. stnffed, white, glabrous. SPORES 

 7-9x5-0 micr., broadly elliptical. ODOR none. TASTE mild. 



Gregarious or subcaespitose. On moist ground in swamps or 

 woods* of birch, maple, hemlock, etc. Marquette, New Richmond, 

 Ann Arbor. August-October. Infrequently found, but probably 

 common in our northern woods. 



This is a slightly larger and firmer species than the preceding. 

 Its pileus is rarely striate and is not viscid. It is, however, closely 

 related to II. niveus. No data are at hand to determine what may 

 be the structure of the gill-trama. 



Var. subborealis, var. now A plant has been found which simu- 

 lates H. borealis, whose spores are markedly larger. If these prove 

 to be constant, it deserves to be considered a separate species. The 

 full description follows: 



PILEUS 1-3 cm. broad, convex, broadly umbonate, obtuse or 

 sometimes depressed-umbilicate, thick on disk, firm, watery white, 

 sub-hygrophanous, not shining, glabrous, even, the thin margin at 

 first slightly incurved, at length spreading. FLESH white. GILLS 



