Jakob E. Lange: Studies in the Agarics of Denmark. IV. 39 



3. R. undatus Fr. (Clitopilus u.) 



Spores 8V S — 9*/ 2 x S 1 ^ — 6 u, oval, irregularly wavy. 



Fig. specimens : I) Rønningesøgård, roadside in park, amongst 

 grass and moss, Sept. 1902; II) Kerteminde, pasture on sandy 

 ground near coast, Sept. 1905. Not common. 



My plant differs from the description of Fries in not having 

 a hollow stem; but in the excellent figure in Fries' Icon. sei. tab. 96 

 the cavity is also wanting. The agaric figured by Cooke (loc. 

 cit. pi. 486) sub nom. Ag. undatus evidently has nothing to do with 

 Fries' species. And undatus Fr. sensu Ricken is a smooth-spored 

 species referred by him to Paxillus. — Fig. II represents a more 

 membranaceous and infundibuliform variety, almost answering 

 to Fries' description of * Ag. viarum. A still more reduced form is: 



3 b. R. undatus var. pusillus J. E. Lange. 



Spores 9 \.i long, subovate, with about 6 obtuse angles. 



Fig. specimens: Hjallese, on naked soil under hedge, roadside 

 in wood, Aug. 1907, gregarious. 



Cap 1 / g — 172 cm > plano-convex, profoundly umbilicate, indi- 

 stinctly striate, dingy pale gray, at first slightly hoary-pruinose 

 (especially towards the edge). Stem paler than cap, not hollow, 

 at first slightly pruinose, 1 — 2 cm x l 1 ^ mm, base slightly white- 

 woolly. Gills rather strongly decurrent, dingy pallid, moderately 

 crowded, arcuate, soon with a pallid-incarnate tinge. Sporedust 

 very pale incarnate. 



Although this little tiny plant at first sight does not at all 

 recall R. undatus, the var. viarum connects them very intimately, 

 and I therefor refrain from making it a distinct species. 



4. R. Mougeotii Fr. var. 



Spores 10 x 7 \a, obtusely angular, ovate. Edge of gills set with 

 hairshaped-cylindric, 6 — 8 \i broad, obtuse cells. 



Fig. specimens: Bramstrup Mose, in boggy meadow, July 1902. 



This plant is very closely related to the form of R. (Entoloma) 

 griseo-cyaneus figured and described pag. 29. Perhaps it is only 

 a sunburnt form of the same species 



Cap convex, at first umbilicate, then somewhat infundibuliform, 

 2 2 / 2 — 3 cm, dark gray-violet, everywhere hairy-tomentose-squamu- 

 lose. Stem 4-- 5 cm x 3 mm, steel gray-lilac, hollow, somewhat 

 fibrillose and with indistinct blackish flocci. Gills adnate, at 

 last somewhat decurrent, whitish then pink. 



5. R. griseo-rubellus Lasch. 



Spores 9 — 10 x 7 — 7 1 / 3 M, broadly ovate, wavy-angular with about 

 6 angles. Basidia 4-spored. 



Fig. specimens: Vormark, Falleskov, growing gregariously in 

 grass, open space in plantation of Picea, Sept 1905. (Also found 

 on sloping ground outside a plantation, at Gelsted, Sept. 1912. 



