Published: Lloydia 5: 146 (1942)
Taxonomic status: Heterotypic synonym of H. albidulum
Types: UNITED STATES: Florida: Alachua, Gainesville; Magnesia Springs (29.5825°N, 82.1492°W, alt. approx. 40 m a.s.l.) on litter in deciduous woodland, 15 Jul. 1938, W.A. Murrill (Holotype. herbarium acc. no. FLAS-F-17941, HJB1000583).
Diagnosis: Pileus convex, 2-3 cm broad, subviscid, white; lamellae sinuate, crowded, spores ovoid, 8-10 x 4-5 μ; stipe white, bulbous, 4 x 0.5 cm-
Commentary: With the mainly gently clavate and clavate-ventricose cheilocystidia, over 40 µm long, and the spores amygdaloid and rather strongly dextrinoid this species belongs to Hebeloma sect. Velutipes. Within this section of the genus, the spores with a consistently loosening perispore, on ave. less than 11.5 × 7.5 µm, with a very strong papilla, and the absence of pleurocystidia, would indicate that this is most likely Hebeloma albidulum. Hence this taxon should be synonymized with H. albidulum. Unfortunately, it was not possible to generate any DNA sequence data from this material. Stuntz examined the holotype in 1976 and left a herbarium note: “This is, I believe, a Hebeloma. The densely clustered clavate slender cheilocystidia, and scurfy punctate apex of stipe suggest it.” Halling (1986) pointed out that Stuntz considered this to be a Hebeloma but it appears that no follow up had occurred. Since we consider the synonymy with H. albidulum as clear, it would be against the code to create a superfluous name by recombining this as a Hebeloma, but include it within the synonyms of H. albidulum. To summarize, based on morphological and habitat data tis is: = H. albidulum Peck.
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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