Jakob E. Lange: Studies in the Agarics of Denmark. IV. 33 



soil, Sept. 1900. B) Nyfæste near Arup, amongst grass and 

 heather, on sloping ground, Oct. 1900. - Not common. 



Very variable. A) forms a transition to Eccilia atrides (which 

 as Fries says is hardly specifically distinct). The gills had a 

 long decurrent tooth; tlie cap was black, shining (sunburnt). In 

 B) the gills were extraordinarily broad, semicircular and broadly 

 adnate. The stem had no black points above, but black striæ 

 formed of the decurrent edge of the gills. - In other cases the 

 cap is rather profoundly umbilicate, even when young. But I do 

 not think these differences sufficient for establishing several 

 distinct species. 



The figure af Cooke (loa cit. tab. 333) is without the blackish 

 edging and altogether different from what I call B. s. It looks 

 like a form of R. (Entoloma) (jriseo-cijaneus or E. ardosiacus 

 (Quélet). 



3. R. placidus Fr. 



Spores 9 — 10 x 6— 6Va u , obtusely angular-wavy. 



Fig. specimens: Trolleborg, around stump of Fagus, in grass 

 Sept.' 1900. Not uncommon, on and around old stumps of 

 Fagus. 



In the figured specimens the stem was minutely striate, not 

 white-pruinate above. 



On decaying stump of Fagus (Hjallese, Oct. 1909) I have met 

 with another, considerably stouter form of this species: Cap up 

 to 4 cm broad, mousegray-brownish, fibrilloso-squamose. Stem 

 short, curved, coarsely striate, (almost grooved) blackish-blue. 



The very large form which Fries figures (Icon. sei. tab. 97) 

 withsquamose cap and the stem all over set with darker squa- 

 mules is more like R. (Entoloma) dichrous. 



4. R. lampropus Fr. 



Spores 9 1 *— ll 1 /., x ßi/ 2 — 7 u, irregularly oval, nodulose; (also 

 10—13 x 7—8 u.)." 



Fig. specimens: Vissenbjerg, amongst grass and heather, on 

 hillslope outside a plantation of Picea, Aug. 1905. Here and 

 there in similar localities. 



The figured specimen was rather slender-stemmed and blackish- 

 blue, almost like no. 5. except for the white gills. In other places 

 I have met with more short-stemmed specimens and also with 

 a form with rather profoundly umbilicate cap. 



5. R. chalybæus (Pers.) 



Spores 10x7 u, irregularly ovate, about 6-angular. Basidia gene- 

 rally 3-spored (but varying, even on the same gill, from 2- to 4- 

 spored. Cvstidia 0. 



Fig. specimens: Hollufgård, in copsewood (Betula, Prunus 

 Padus etc.), gregarious, Sept. 1917. — Also found at Krabbes- 

 holm, Sept. 1917 (in wood of Fraxinus and Alnus). 



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