106 SECTION HYGROTRAMA 



Basidia 22-33 X 4-6 /a, 4-spored. Pleuroeystidia and cheilocystidia none. 

 Gill trama somewhat parallel, composed of large more or less rectangu- 

 lar cells, at times appearing somewhat interwoven, the cells 17-55 X 

 6-15 fx. Cuticle a surface zone of inflated cells, 12-33 X 15-23 /*, ir- 

 regularly dispersed, often scattered but at times hymeniform. Clamp 

 connections none. 



Habit, Habitat, and Distribution — On soil, Michigan, August; 

 also in Europe. It has recently been reported and redescribed from 

 England by Orton (1960). 



Matebial Studied — Michigan: Smith 50294, from Tahquamenon 

 Falls State Park, Upper Peninsula, Mich. 



Obsebvations — The spores of Smith's Michigan collection are 

 slightly larger than is given for British and other European specimens. 

 Orton (1960) says that in Britain, it appears to be a grassland species, 

 and points out that Bresadola gives the habitat as larch woods (per- 

 haps in grass). It resembles H. nitratus in color and habit but is 

 smaller and more tough. For a comparison with H. hymenocephalus 

 see that species. 



47 



Hygrophorus rugulosoides, sp. nov. 



Illustration: 

 Fig. 26. 



Pileus 10-15 mm lotus, convexus deinde convexo-depressus, glaber, 

 hygrophanus, planus vel paulo rugulosus, atro-olivaceo-brunneus de- 

 mum cinereus; odore et gustu mitis; lamellae arcuatae demum decur- 

 rentes, "wood brown" demum olivaceo-brunneae, latae, subdistantes; 

 stipes 2-3 cm longus, 2-3 mm crassus, aquoso-cinereo-brunneus; sporae 

 4.6-5 X 4-4.5 /a, subglobosae. Specimen typicum in Herb. Univ. Mich.; 

 ledum in Colonial Point, Burt Lake, Mich., Aug. 4, 1961, Smith 

 63826. 



Pileus 10-15 mm broad, convex, becoming convex depressed, sur- 

 face glabrous, moist, hygrophanous, even to slightly rugulose, opaque 

 when moist, dark olive brown fading to cinereous, margin crenate to 

 uneven. Context thin, fragile, in KOH dull olive (but not olive as re- 

 vived in KOH); odor and taste mild. 



Lamellae arcuate to decurrent, broad, subdistant, "wood brown" to 

 olive brown when mature, edges even. 



Stipe 2-3 cm long, 2-3 mm thick, equal, undulating, watery gray- 

 brown, paler than the gills, translucent, naked or only with very ob- 



