Jakob E. Lange: Studies m the Agarics of Denmark. III. 7 



6 b. P. Roberti var. 



Spores almost globose, 7 — 8 X 6 — 7 ju. Cystidia inflated cylindric- 

 ellipsoid, 14 — 19 u. broad. 



Fig. specim.: Fruens Bøge, on rotten twig in foliaceous wood. 

 July 1900. Cap convex-campanulate, small (12 mm). This form 

 is intermediate between P. Roberti and P. hispidulus. 



(As I have not had the opportunity to examine this species 

 for many years I am not quite certain about its absolute want 

 of hooked cystidia. But to judge from its close affinity to P. his- 

 pidulus it is not likely to have any such). (Vide also no. 4 b.). 



7. P. hispidulus Fr. 



Spores almost globular, 5 l j 2 — 7 x 5 — 5 3 / 4 u, Cystidia inflated-club- 

 shaped, 13 — 16 p. broad. 



Fig. specim.: Killerup, foliaceous copsewood, solitary on the 

 ground (moist leaf-mouldy soil), Sept. 1905. 



This elegant little species is well characterized by the soot-black 

 hairs which almost entirely cover the whitish cuticle. In the 

 middle they form erect, pilose squamules, towards the edge 

 adpressed, hairy fibrils. 



8. P. plautus (Weinm.). 



Spores oval-subglobose, 7 — 8V3 x 6—7 u. Cystidia on edge 16 — 24 |u 

 broad, fusoid-ventricose, without hooks. The sides of the gills 

 are very sparingly set with similar cystidia. The filaments on 

 the surface of the cap are obtuse inflated cylindric, 14 — 24 |li broad, 

 pale fuscous-brownish. 



Fig. specim.: Hjalle-e, on rotten trunk of Picea, Oct. 1901 (and 

 Aug. 1902). Also found in same locality Aug. 1913 (a paler, less 

 strongly umbonate and smaller specimen). 



9. P. umbrosus (Pers). 



Spores ovate-globose, b x j.>— 6 X 4 — 5 u, Cystidia on edge fusoid- 

 bladder-shaped, 15 — 25 \i broad; content yellowish-brown. 



Not figured. Found at Hjallese, on rotten stump of Populus 

 in outskirt of wood, Sept. 1897, and on stump of foliaceous tree, 

 Trolleborg, Oct. 1900. — The cap was about 4 cm broad, the stem 

 somewhat fuscous. This plant is very well described by Ricken 

 (1. cit. p. 278). It seems to me very closely related to P. plautus, 

 (almost like P. umbrosus (sensu Bresadola) to P. cervinus). But 

 which of the two is the true Ag. umbrosus of Persoon I cannot 

 decide (vide page 5). 



10. P. cinereus Quel. 



Spores subglobose-ovate 7 x 5 x / 4 u. Cystidia inflated, with or 

 without a hairlike appendix of varying length. Cells from 



