Jakob. E. Lange: Studies in the Agarics of Denmark. III. H 



question remains whether it would be preferable to place them 

 in Collybia or Naucoria. In all the species the spores are (sub 

 micr.) hyaline, and in some of them the sporedust is white or at 

 least pale cream-coloured (Collybia mimica Smith and other spe- 

 cies). But as the most common representative of the genus, 

 Ag. Cucumis, has somewhat ferrugineous or incarnate-lawny 

 sporedust, and all of them have large conic-subulate cystidia, I 

 dare not at present place them in Collybia. Probably the best 

 plan will be to include them in Naucoria as a special tribe 

 (Collybiopsis or Pisciodorce). 



My reasons for transferring Armiltaria mucida to Collybia 

 are stated in part II of these studies. I notice that Ricken (Die 

 Blätterpilze) has adopted the same view (which was, I believe, 

 first propounded by Quélet (Flore mycologique)). 



In another direction Collybia shows very strong affinity to 

 Marasmius. In fact the line of demarcation is in several places 

 very difficult to discern. In doubtful cases I generally refer to 

 Marasmius any species with thick and firm gills, while those 

 with membraneous and crowded gills are retained in Collybia. 

 Thus Agaricus confluens (= Marasmius argyropus) I place in 

 Collybia. To lump the two genera in one, as Kahsten does, 

 appears to me rather rash. 



But although fairly well separated from the adjoining genera 

 the Collybias do not form a natural series of closely related 

 species, but are rather heterogeneous. Such fungi as f. inst. 

 Collybia iudicata — C. velutipes -- C. racemosa have certainly not 

 very much in common. Still I shall not attempt to divide the 

 genuine Collybias into subgenera. The old Friesian classification 

 cannot, I believe, be much improved upon. Of his groups Ve- 

 stipedes is the most unsatisfactory one, uniting, I think, too 

 heterogeneous species and separating others which ought not to 

 be kept apart (f. inst. C. teuacella and C. conigena). This group 1 

 have therefore partly disbanded. 



With regard to the microscopic characteristics Collybia 

 shows less variety than f. inst. Lepiota. As mentioned above 

 cystidia are wanting in a good many species, and in most 

 others they are rather inconspicuous, hairshaped or like short 

 hyphæ on the edge of the gill. But in a few instances we find 

 more characteristic cystidia. Thus C. radicala has large saek- 

 sbaped cystidia, in C. velutipes they are obtusely fusiform and in 

 C. teuacella they are often more or less hooded. — The spores 





