Dansk Botanisk Arkiv. Bd. 2, Nr. 7. 



K E Y 



TO THE SPECIES OF THE GENUS PLUTEUS FIGURED IN 

 »DANMARKS AGARICACEER«. 



A. Tricholomatæ. Cuticle smooth or pilose-squamulose, made up of filaments, 

 a. Coronatæ. Cystidia ^011 sides of gills) crowned with 2 — 5 hooks or 



corniculate excrescences. Spores broadly oval. 



a. Cap soot-brown or gray. 



1. Cap paler or darker soot-brown, large (6— 10 cm). . P. cervinus (1) 



2. Cap glaucous-gray, smaller 4— 5 cm P. salicinus (2~i 



b. Cap whitish. 



1. Cap very large and fleshy 8 — 15 cm broad) .... P. petasatus ,'i 



2. Cap smaller (5 — lem) P. pellitus 4 



|3. Depauperatæ. No hooked cystidia. Spores subglobate. 



a. Cap whitish, set with small, dark scpiamules. 



1. Gap 2—4 cm, slightly squamulose. 



* Cap becoming minutely squamulose all over, .scpia- 

 mules dirt-brownish P. gracilis 5) 



1r Cap slightly pilose-squamulose* in the middle ... P. Robert i (6) 



2. Cap 1 cm, everywhere densely clad with fuscous, pilose 

 squamules P. hispidulus (7 



b. Cap dark umber or gray, velvety pruinose. 



1. Cap dark umber, velvety. Cystidia without hairlike appendix. 



:|: Edge of gills not dark /'. plautus 8) 



* Edge of gills fuscous /'. umbrosus (9. 



2. Cap gray, with a powdery bloom. Cystidia often with 



a hairlike appendix P. cinereus 10 



B. Micaceæ Cuticle smooth or somewhat mealy, formed of sub- 

 globular cells. Spores almost spherical. 



a. Cap white, surface micaceous-mealy P. semibulbosus 11 



ß. Cap coloured, pruinate or almost naked. 



a. Margin translucidly striate. Gap small ,2 — 3 1 /., , pale 



gray P. Godeyi var. (12 



b. Margin not striate. 



1. Cap cinereous, rather large ('.\ — 4 l ,cm) ..../'. cine reo -fusens (13 

 1. Gap soot-brown or yellowish. 



* Cap soot -brown. 



j Stem white P. nanus (14) 



ff Stem (and young gills) Hushed with lemon- 

 yellow P. n. var. lutescens 



%_ Gap yellowish-cinnamon P. chrysophæus 15 



