40 Dansk Botanisk Arkiv, Bd. 2, Nr. 11. 



Central part of cap slightly squamulose. Stem smooth, gla- 

 brous. Gills at first whitish, rather distant, horizontal, adnate 

 and slightly decurrent. 



5 b. R. g. var. 



Spores longer (10—13 X 7—8 u). 



Fig. specimens: Bramstrup mose, on boggy ground, July 1903. 



Stem slenderer and paler, but for the rest not differing mate- 

 rials' from the type and probably only a palustrine form. 



6. R. nigrella (Pers.?) Quel.? 



Spores 9 — 12 x 6'/ 2 — 7 1 / 2 |u, ovate (subspheric or oblong) irregu- 

 larly wavy-angular. 



Fig. specimens: Dalum Landbrugsskole, solitary in a garden, 

 bed of hardy perennials, July 1898. 



As I have only seen a single specimen of this characteristic 

 little agaric I am not in a position to decide its systematic po- 

 sition. Probably it is identic with what Quélet called R. nigrella 

 Pers. (Saccardo V no. 3027). As his description is very brief I 

 give here my own diagnosis : Cap 1 cm broad, infundibuliform, 

 fuscous (becoming blackish), edge striate. Stem smooth, subfus- 

 cous-steelgray with a slight violet tinge, somewhat fistulöse, 2 1 /a 

 cm x 2 mm. Gills narrow, strongly decurrent, incarnate Flesh 

 steelgray. 



B. SUBSPHÆROSPORÆ. 



7. R. rusticoides Gill. 



Spores 8x6 fi, subspheric 5-anguIar. 



Fig. specimens: 1) Håre Bjerge, sandy hillslope amongst 

 lichens, grass and Sarothamnus, Oct. 1907; 2) Hjelmernp, sandy 

 hedgerow, Oct. 1915. — 



This very distinct species — which Fries did not know — 

 appears to me very nearly allied to his Agaricus parkensis (espe- 

 cially as represented in his figure (Icon. sei. I) in which the gills 

 are fuscous (while in the diagnosis they are said to be whitish). 



8. R. rhodocylix (Lasch). 



Spores 8 — 10 u. in diameter, subspheric 5-angular. Basidia 

 4-spored. Cystidia coarsely hairshaped. 



Fig. specimens: Højsholt near Tommerup, on decaying slump 

 of Betula in boggy wood, Sept. 1908. Also found at Sandager, 

 growing in a bog under Alnus and Picea (on the ground amongst 

 dead needles), Aug. 1913. 



[Under Subsphærosporæ also might be sought Clitopilus popi- 

 nalis Fr. which has very small, almost spheric spores (about 5u 

 in diameter), but which probably should be transfered to Paxillus.} 



