270 THE AGARICACEAE OP MICHIGAN 



259. Psathyra obtusata Fr. 

 Syst. Myc, 1821. 



PILEUS 1-3 cm. broad, campanulate-convex, obtuse, hygropha- 

 nous, umber and faintly or not at all striate when moist, pale 

 ochraceous to buff and atomate when dry, glabrous; veil none. 

 FLESH thin. GILLS ascending, adnate, rather broad, close to sub- 

 distant, umber when mature, edge white-fimbriate. Stem 5-8 cm. 

 long, 1-3 mm. thick, equal, glabrous, hollow, white then pallid, rigid- 

 fraeile, flexuous, curved at base. SPORES elliptical, 7-9x4-4.5 

 micr., smooth, dark purplish-brown. 



Solitary or subcaespitose, on very rotten wood. September. 

 New Richmond, Bay View. Infrequent. 



Distinguished from the preceding by the obtusely convex pileus, 

 more scattered habit and shorter steins. Form minor: This varies 

 smaller, with a pileus .5-1 cm. broad and rather slender stem. The 

 spores, etc., are the same. Cook's figure (111., PL 593) does not 

 represent our plants. 



260. Psathyra persimplex Britz. 

 Bot. Centralbl., Vol. 77, p. 436, 1899. 



PILEUS 1-2.5 cm. broad, campanulate at first then campanulate- 

 convex, obtuse, margin soon spreading, hygrophanous, rufous-brown 

 to fuscous brown and striatulate when moist, whitish-buff to pale 

 ochraceous when dry, atomate, glabrous. Veil none. FLESH very 

 thin. GILLS ascending-adnate, rather broad, ventricose, close to 

 subdistaht, whitish then gray to grayish-umber, edge white-fimbriate. 

 STEM 4-10 cm. long, slender, 1-2 mm. thick, equal, whitish or pallid, 

 somewhat fragile, stuffed by white pith then hollow, glabrous, shin- 

 ing, flexuous, pruinate at apex, rooting at base and attached to 

 wood by hairs. SPORES elliptical, 10-12 x 5-6.5 micr., obtuse, 

 smooth, dark purple-brown under the microscope. CYSTIDIA 

 scattered or few on sides of gills, up to 70 x 15 micr., sometimes 

 bifurcate at apex, ventrieose-lanceolate; smaller on edge, 30-45 x 

 12 micr., obtuse. BASIDIA 30x10-12 micr., 4-spored. ODOR 

 none. 



Gregarious on sticks and decayed wood in hemlock woods. New 

 Richmond. September. Rare. 



This seems to be a segregate from P. obtusata, from which it 





