190 



AGARICACE^E 



Psathyra 



XXXVIII. PSATHYRA Quel. 

 (From the friable substance; Gr. psathuros, friable.) 



Veil when present universal, floccoso-fibrillose, not annulate, 

 sometimes obsolete. Hymcnophore confluent with, but heterogeneous 

 from the cartilaginous stem. P ileus conical or campanulate, then 

 expanded, submembranous, margin at first straight and adpressed to 



Fig. 47. — a, section of Psathyra conopilea Quel. ; 



B, P. bifrons Sacc. entire and in section. 



One-half natural size. 



the stem, except 884. Stem central, somewhat cartilaginous, fistulose,. 

 lustrous, fragile, simple. Gills at first pale, becoming purple or 

 fuscous. Spores purple, brownish-purple, dark purple or dark brown. 



(Fig- 47-) 



The species grow on the ground, or on rotten wood, they are 



slender, fragile, hygrophanous and with fugitive colouring. 



Psathyra agrees in structure with Myeeua, A T olanea, Galera and 



Psathyrella. Species 872 — 893 



a. Conopikce. Veil obsolete. Pileus conico-campanulate. Stem 



tense and straight, fistulose. Gills usually adnexo- 

 ascending, often free. On the ground in grassy or damp 

 places. ' 872 — 877 



b. Obtusatce. Veil obsolete. Pileus campanulato - convex, 



becoming flat ; smooth or atomate. Gills piano- or arcuato- 

 adfixed. 878 — 880 



e. FibrilloscB. Pileus — except 884 and 888 — and stem at first 

 fibrillose or floccose from the veil. Stem fistulose. 



881—893 



