Published: N. Amer. Fl. 10 (3): 217 (1917)
Taxonomic status: This is a Pholiota.
Notes: Current name: Pholiota gregariiformis (Murrill) A.H. Sm. & Hesler, The North American species of Pholiota: 304 (1968)
Types: UNITED STATES: Alabama: Auburn (approx. 32.6097°N, 82.4808°W, alt. approx. 80 m a.s.l.) on soil in coniferous woodland under Pinus sp., 26 Dec. 1899, F.S. Earle, det: W.A. Murrill (Holotype. herbarium acc. no. NY 814867, HJB1000273).
Diagnosis: Pileus convex to expanded, rather thin, gregarious, 2-2.5 cm. broad; surface smooth, glabrous, viscid, pale-yellowish-brown, sometimes slightly darker on the disk, margin entire, concolorous; lamellae adnate or slightly sinuate, subcrowded, many times inserted, rather narrow, creamy-white, becoming pale-dingy-yellowish-brown; spores ovoid, smooth, melleous under the microscope, 8-9 X 5-6 μ; stipe slender, concolorous, smooth, glabrous, about 5 cm. long and 3 mm. thick; veil slight, arachnoid, evanescent.
Commentary: Pholiota gregariiformis was originally described by Murrill (1917) as Hebeloma gregariiforme. The smooth ovoid spores (7–9 × 4.5–6 µm) have a clearly visible germ pore. The cheilocystidia were largely ventricose, often utriform and chrysocystidia were observed, mainly ventricose with a long neck. An ITS sequence was generated from the holotype. Both morphological and molecular results, support the recombination into Pholiota. The ITS sequence generated from the type clustered within what Tian and Matheny (2021) referred to the clade of P. subgen. Flammuloides, under the provision that the type of the subgenus, for which no type has been sequenced, would be a member of this clade. The pileus surface, not scaly according to the original description by Murrill (1917), meets the definition of the subgenus by Jacobsson (2018). There appears to be some confusion, whether all members of this clade (and species in the P. sect. Flammuloides key of Jacobsson 2018) indeed lack chrysocystidia (Gröger 2014; Tian and Matheny 2021), or more generally, whether the morphological circumscription of the subgenus agrees with the clade.
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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