Jakob E. Lange: Studies in the Agarics of Denmark. IV. 21 



tive heads are only developed in damp places. When they are 

 wanting you have M. Rotula var. phyllophila Schroeter which is 

 rather common in our woods (on leaves of Fagus and Quercus). 



15. M. limosus Quélet. 



Spores 12 x 5V 2 > pipshaped-lanceolate. Cyslidia obovate, about 

 12 u broad, apex warty. 



Fig. specimens: Kirkeby, on dead leaves of Aira cæpitosa 

 (boggy ground in wood, Nov. 1911, gregarious). 



Very tiny an flaccid. Cap about 2 mm, whitish with a tinge 

 of wood-colour, stem only 1 / i mm thick. 



1(5. M. graminum (Lib.) 



Spores 8 — 12 x 5 u, narrowly pipshaped. 



Fig. specimens: Sanderum in bog, on dead grass, gregarious, 

 Juli 1897. It differs from no: 15 by the tile-red cap and the 

 fuscous (not blackish) stem. Rare. 



[I have met a form of this species (?), (Kerteminde, on Agrostis 

 alba, on lawn, Aug. 1917) differing from the main type by some- 

 what larger and paler cap (only the central part tile-reddish), at 

 first with a small papilla but soon umbilicate (number of gills 

 6—13). The spores were somewhat smaller (9 1 /«— 10 1 /* x ^ l U~- 

 4 x /-> H) and no cystidia to be found. This probably is M. Cur- 

 reiji (B. et Br.), Cooke's Illustr. pi. 1130; but it is rather too 

 close to M. graminum to deserve specific rank. Cooke's concep- 

 tion of the graminum-group appears to me altogether somewhat 

 ambiguous. M. graminum (as I conceive it) he describes sub 

 nom. Mycena juncicola Fi\, while his figure and description of 

 M. graminum (loc. cit. pi. 1129) depicts quite another agaric 

 (with globular, minute spores).] 



|3. PERFORANTES. 



17. M. androsaceus (L ) 



Spores 7 x 3 J / 2 u > ellipsoid-pipshaped. 



Fig. specimens: Tommerup, on dead branches of Picea in 

 dense plantation, June 1898. Not uncommon, especially on 

 Calluna, on heaths, but also on needles of Pinus etc. In damp 

 places it develops an aerial mycelium consisting of black, hair- 

 like creeping strings. 



18. M. perforans (Hoffm.) Fr. (M. abietis (Batsch).) 



Spores 5 — 7 x 3 1 / 3 q, pipshaped. 



Fig. specimens: Årup, on dead needles of Picea, Oct. 1896. 

 Very common, and often very numerous; always springing from 

 a single needle. 



19. M. recubans Quélet. 



Spores 10 — 13 x 4V 8 — 5 u, fusiform-ellipsoid. Cystidia cylindric, 

 omewhat ventricose, total length about 40 u, breadth 7 — 10 u. 

 s 



