Published: N. Amer. Fl. 10 (3): 219 (1917)
Taxonomic status: Heterotypic synonym of H. sordidulum
Types: UNITED STATES: New York: Bronx Co., New York Botanical Garden (approx. 40.8621°N, 73.8769°W, alt. approx. 750 m a.s.l.) on soil under Fagus sp., 12 Nov. 1901, F.S. Earle (FSE51), det: W.A. Murrill (Holotype. herbarium acc. no. NY 814864, HJB1000286; Isotype. herbarium acc. no. WTU-F-039671, HJB1000348).
Diagnosis: Pileus convex to plane, solitary or somewhat gregarious, 3-4 cm. broad; surface slightly viscid, smooth, glabrous, rosy-isabelline, somewhat darker on the disk, margin pallid, not striate, silky; context thin, whitish, with mild taste and pleasant odor; lamellae deeply sinuate, subcrowded, rather broad, pallid to subfulvous; spores ovoid, obliquely apiculate at the base, very pale melleous under the microscope, smooth, 9-10 X 6 μ; stipe equal, glabrous, shining, minutely floccose above, white, solid, 3-4 cm. long, 3-5 mm. thick.
Commentary: With the mainly clavate-ventricose cheilocystidia, over 40 µm long, and the spores amygdaloid and not strongly dextrinoid this belongs to Hebeloma subsect. Clepsydroida within H. sect. Denudata. Within this section of the genus, the spores, on ave. less than 13.5 x 7 µm, with a very strong papilla, almost snout-like, would indicate that this is most likely Hebeloma sordidulum. An ITS sequence, generated from the holotype, supports this determination (Fig 4 of Eberhardt et al. 2022). Hence this taxon should be synonymized with H. sordidulum as suggested in Eberhardt et al. (2022). So, based on morphological and molecular analysis, this is: = Hebeloma sordidulum Sacc.
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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parvifructum | parvifructus | patriciae | peckii | perangustisporium | perfarinaceum | perigoense | permollis | perpallidum | perplexum | petiginosum | petiginosus | petrakii | piceicola | pinetorum | pitkinense | platense | polare | politum | porcatosporum | praecaespitosum | praecox | praefarinaceum | praefelleum | praefinitum | praefinitus | praelatifolium | praeviscidum | proletaria | proximum | psammicola | psamminum | psamminus | pseudofastibile | pseudomesophaeum | pseudopunctatum | pseudostrophosum | pudica | pumiloides | punctata | punctatiforme | punctatum | punctatus | pyrophilum | pyrrholepidum | pyrrholepis | queletii | radicatum | radicatus | radicosa | radicosus | remyi | repandum | repandus | riparium | rivulosum | robustum | ruber | rubrofuscum | rubrum | rufosporum | salmonense | sambucinum | sambucinus | sanjuanense | sarcophyllus | scabella | scabellum | senatum | senescens | sericipes | siegelii | siennaecolor | simile | sinapiolens | sinuosa | sinuosum | sinuosus 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