Bd. 2 • DANSK BOTANISK ARKIV • Nr. 7 



UDGIVET AF DANSK BOTANISK FOHENING 



1917 — 



Studies in the Agarics of Denmark 1 ). 



Part III. 



Pluteus. Collybia. Inocybe. 



By 



Jakob E. Lange. 



NEV 

 With three plates. 



THE GENUS PLUTEUS. 



/ luteus is one of the best defined genera of the whole 

 mushroom-family. While most other genera are rather heteroge- 

 neous, — being made up of different series or groups, some of 

 which show so strong affinity to other genera that they might 

 almost as well be removed to a neighbouring genus — a Plu- 

 teus is always a Pluteus and nothing else. — From Volvaria, 

 with which it has most in common, the genus is clearly distin- 

 guished by its total want of a volva. And Pluteolus (the genus 

 next in kind in the opposite direction) not only differs from Plu- 

 teus by the ochraceous and ellipsoid spores, but also by a 

 totally different texture of the gills (want of inflated cystidia etc.). 



Pluteus is a truly xylophilous genus. Hut while the larger 

 species almost exclusively grow on rotten slumps and trunks, the 

 smaller ones, such as hispidulus, semibulbosus etc., may also 

 be found growing on the ground (but only where the soil is 

 made up of leaf-mould, rotten twigs, peat or other decaying ve- 

 getable matter). 



') Fart I of these Studies (General Introduction. The Genus Mycena was 

 published in »Dansk Botanisk Arkiv« Vol. I no. 5 (1914), part II (Amanita. 

 Lepiota, Coprinus) in vol. II no. 3 (1915). 



»Danmarks Agaricaceer« now comprises about 900 watercolour- 

 plates, all painted by the author. For further particulars see part I. 



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