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Nomenclature

Russula betularum Hora
Trans. Brit. Mycol. Soc. 43: 456. 1960.

Russula emetica var. betularum (Hora) Romagn.
Russules d'Europe Afr. Nord: 401. 1967.

Original diagnosis

Pileo carnosulo, 20-50 mm, roseo-rubello, disco lutescens, plano depressove, margine demum subtuberculoso-sulcato, carne sub pellicula separabili alba; lamellis subconfertis, albis, acie levi, sinuoso-adnexis; stipite 25-65 x 7-12 mm, albo, aequali; sporis in cumulo albis, 8-10 x 7-8 µm reticulatis vel subreticulatis (sec typum III Singeri), ornamentazione amyloidea 1 µm; sapore acri; odore debili, mellem revocante; cystidiis pilei plus minus clavatis, numerosis, interdum cylindraceis, (3) 6-8 µm latis; cystidiis lamellarum plus minus cylindraceis, apice apiculato-acuminatis, 5-7 µm latis; FeSO4 et solutione phenolica normaliter reagente; NH4OH negativus. In betuletis. Typus: Oxshott, Surrey, 5 Nov. 1958 in Herb. Hora.

Typification

Holotypus: Herb. Hora, Oxshott, Surrey, 5 Nov. 1958
Europe: United Kingdom
In betuletis

Description

Photographs

Microscopy

SEM photos