Russula-romellii_spore_1M

Description:

Russula romellii Maire, syn.: Russula alutacea (Pers.) Fr., Russula alutacea subsp. romellii (Maire) SingerRomelli's Brittlegill, DE: Weistieliger LedertublingSlo.: malinova golobicaDat.: Oct. 9. 2013Lat.: 46.39986 Long.: 13.70143Code: Bot_759/2013_DSC8496Habitat: grassland, former pasture gradually overgrowing with Fagus sylvatica and Picea abies; flat, calcareous, old alluvial ground; quite in shade; exposed to direct rain; average precipitations ~ 3.000 mm/year, average temperature 5-7 deg C, elevation 980 m (3.200 feet), alpine phytogeographical region.Substratum: soil.Place: Zadnja Trenta valley, Zapodn place; left bank of dry bed of river Soa; somewhat upstream of the last pastures; East Julian Alps, Posoje, Slovenia EC Comments: From far I thought I found Russula queletii. But totally white stipe, distinctly colored gills and the fact that it had mild taste quickly ruled this option out. Very dense, straw colored, very sparsely branched gills with entire edge, and almost no short gills that extend only part way to stipe, as well as other macroscopically traits and dimensions and surface ornamentation of spores fit well to Russula romellii. However, whenever I call to mind how many species exist in this genus I start to doubt in my determinations. Growing solitary. Pileus diameter 10.5 cm, taste and smell mild; SP beige-yellow-ocher, oac 812.Spores coarsely warty and/or spiny with ridges. Dimensions: 6.6 [7.7 ; 8.1] 9.3 x 5.7 [6.7 ; 7.1] 8.1 microns; Q = 1 [1.1 ; 1.2] 1.3; N = 40; C = 95%; Me = 7.9 x 6.9 microns. Olympus CH20, NEA 100x/1.25, magnification 1.000 x, oil, in water in vivo. AmScope MA500 digital camera.Ref.:(1) G.J. Krieglsteiner (Hrsg.), Die Grosspilze Baden-Wrttembergs, Band 12345, Ulmer (2000), p 501.(2) S. Buczacki, Collins Fungi Guide, Collins (2012), p 314. (3) J. Breitenbach, F. Kraenzlin, Eds., Fungi of Switzerland, Vol.6., Verlag Mykologia (2005), p 234. (4) R. Phillips, Mushrooms, Macmillan (2006), p 33.(5) L. Hagar, Ottova Encyklopedia Hb, Ottova Nakladatelstvi, Praha (2015) (in Slovakian), p 411.