Full name: Hebeloma gomezii Singer (1983)
Published: Beihefte zur Nova Hedwigia 77: 188 (1983)
Taxonomic status: Heterotypic synonym of H. sordidulum
Types: COSTA RICA: Guanacaste, Santa Rosa National Park (approx. 10.8379°N, 85.7051°W, alt. approx. 250 m a.s.l.) on sandy, shallow soil in mixed but mainly deciduous, subtropical woodland under Quercus oleoides, 25 Jul. 1981, R. Singer, L.D. Gomez, det: R. Singer (Holotype. herbarium acc. no. F C0004354F, HJB1000393).

Original diagnosis: Pileo brunneolo-gilvo margine albidogilvo, levi, glabro, nudo, viscido, obtuso, 38 mm cc. lato; lamellis haud lacrimantibus rotundato- vel sinuato-adnexis; stipite albo, apice fibrilloso-pruinoso nec non minute fibrilloso usque ad basin sed in tertio inferno glabrescente, subaequali vel basin versus subattenuato, neque radicante neque bulboso, 55 x 5-6 mm cc.; velo nullo; carne alba; odore saporeque raphanaceis. Sporis 9-12 x 5-5.8 μm, fusoideis, ornamentatione granulatopunctata asperulatis, apice subacutis rarius obtusis sed poro germinativo calloque destitutis, tegumento perisporiali vix manifesta; cheilocystidiis 45-68 x 5.5-14 μm ellispoideo-pedicellatis vel clavato-pedicellatis; epicute ixotrichodermiali; hypodermio ex hyphis pigmento incrustatis, cutiformiter dispositis efformato; dernatocystidiis nullis. - Inter folia dejecta quercina nec non Burserae, Quercu oleoidi associata species. Typus a Singer et Gomez (B 12445) in Guanacaste, Costa Rica, lectus et in F conservatus.

English translation: Pileus brownish-yellow, whitish-yellow on the margin, smooth, glabrous, bare, viscid, obtuse, about 38 mm broad; lamellae not beaded, rounded- or sinuate-adnexed; stipe white, fibrillose-pruinose at the apex and also minutely fibrillose down to the base, but becoming glabrous on the lower third, almost equal or slightly tapered towards the base, neither rooting nor bulbous, about 55 x 5-6 mm; veil none; context white; smell and taste raphanoid. Spores 9-12 x 5-5.8 μm, fusoid, roughened because of a granulate-punctate ornamentation, with subacute more rarely obtuse apex but lacking a germ pore and callus, perisporial wall hardly visible; cheilocystidia 45-68 x 5.5-14 μm ellipsoid-stipitate or clavate-stipitate; epicutis an ixotrichoderm; hypoderm a cutis made up of hyphae with encrusting pigment; dermatocystidia none. – Species [found] in oak leaf litter and associated with Bursera, Quercus oleoides. Typus collected by Singer and Gomez (B 12445) at Guanacaste, Costa Rica, and conserved at F.

Commentary: Based on morphological and molecular analysis this is: = Hebeloma sordidulum Sacc.