Published: Syll. Fung. 5: 797 (1887)
Taxonomic status: We have not been able to unambiguously determine the current genus of this name.
Basionym: Agaricus medianus Britzelm. (1883)
Types: Not designated. Described from Germany inwoodland near Oberstaufen.
Original diagnosis: Hut bis 5 cm. breit, halbkugelförmig, oft mit einem stumpfen Buckel in der Mitte, gelbbraun, der Rand mit weißlichen Schleierresten. Stiel über 5 cm. hoch, oben bis 5 mm. breit, unten verdickt, voll. Hut- und Stielfleisch Weiß. Lamellen angeheftet, nicht gedrängt, blass gelbbraun, Schneide Weiß. Ohne besonderen Geruch. Spores 8-10; 5-6. Während des Sommers in Wäldern bei Oberstaufen.
English translation: Pileus to 5 cm broad, hemispherical, often with a blunt umbo in the centre, yellow-brown, at margin with whitish remnants of veil. Stipe more than 5 cm long, at apex to 5 mm broad, broadened at base, stuffed. Context of pileus and stipe white. Lamellae adnate, not crowded, pale yellow-brown, with white edge. Without special odour. Spores 8–10 × 5–6 μm. During the summer in forests near Oberstaufen.
Commentary: Described as medium sized, with a unicoloured yellow-brown pileus with a white veil at the margin and white flesh in the pileus and stipe. The spores are also described as being rather small and, in the drawing referred to within the protologue (fig. 39), the spores are shown as amygdaloid to fusoid. The combination of the shape and size of the spores rules out all known Hebeloma species of Hebeloma sect. Hebeloma. This leaves the only possibility as it being from H. sect. Scabrispora. However, the protologue makes no mention of a rooting stipe and there is no sign of any in his drawing. So, we are unable, unambiguously, to interpret this species
All current species: aanenii | adherens | aestivale | albidulum | alboerumpens | albomarginatum | album | alpinicola | alpinum | ambustiterranum | aminophilum | ammophilum | angelesiense | angustilamellatum | anthracophilum | arcticum | asperosporum | aurantioumbrinum | australe | avellaneum | bellotianum | birrus | bulbiferum | catalaunicum | caulocystidiosum | cavipes | celatum | cinnamomeum | circinans | cistophilum | citrisporum | cohaerens | colvinii | crustuliniforme | cylindrosporum | danicum | discomorbidum | duracinoides | eburneum | echinosporum | erebium | erumpens | excedens | flavidifolium | fuscatum | fusisporum | geminatum | grandisporum | griseopruinatum | harperi | helodes | hiemale | ifeleletorum | immutabile | incarnatulum | indicum | ingratum | ischnostylum | islandicum | kelloggense | lactariolens | laetitiae | laterinum | leucosarx | limbatum | lindae | louiseae | luchuense | luteicystidiatum | lutense | mackinawense | magnicystidiatum | marginatulum | matritense | mediorufum | melleum | mesophaeum | minus | monticola | nanum | nauseosum | naviculosporum | neurophyllum | nigellum | nitidum | nothofagetorum | odoratissimum | olympianum | pallidolabiatum | paludicola | parcivelum | parvicystidiatum | parvisporum | pascuense | perexiguum | plesiocistum | populinum | porphyrosporum | praeolidum | psammophilum | pseudoamarescens | pseudofragilipes | pubescens | pumilum | pungens | pusillum | quercetorum | radicans | radicosoides | radicosum | rostratum | sacchariolens | sagarae | salicicola | sarcophyllum | serratum | sinapizans | sordescens | sordidulum | spetsbergense | sporadicum | subaustrale | subconcolor | subfastibile | subtortum | syrjense | theobrominum | vaccinum | velatum | velutipes | vesterholtii | victoriense | vinosophyllum | viscidissimum | youngii
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