Mycetinis Earle., 1909. Bull. N. Y. Bot. Gard. 5: 414.

Petersen, Ronald H. & Hughes, Karen W., 2017, An investigation on Mycetinis (Euagarics, Basidiomycota), MycoKeys 24, pp. 1-138 : 4

Mycetinis Earle., 1909. Bull. N. Y. Bot. Gard. 5: 414.

Marasmius Basionym. § Mycinopsis Schroeter. 1889. Krypto. Fl. Schles. 3': 558. Earle: "This includes Marasmius § Mycena , subsection Chordales , of the Sylloge." = Marasmius sect. Alliacei Kühner. 1933. Botaniste 25: 87. (as " Alliatiae ")

Type species.

Marasmius alliaceus (Jacq.) Fr. 1838. Epicrisis 383.

Mycetinis description.

Basidiomata marasmielloid, marasmioid or collybioid, either diminutive or moderately sized, reviving or not. Pileus 3-15 or 20-50 mm broad, at first strongly convex becoming campanulate to convex to applanate with decurved margin, off-white to pigmented in brownish, reddish brown to yellowish brown with disc always somewhat darker than limb or margin, smooth or suede-like, sometimes weakly hygrophanous; pileus margin entire to shallowly sulcate-striate; trama thin to fairly thick. Pileus trama pliant. Lamellae ridge-like to well-developed, thin or thick, distant to moderately crowded, free, adnexed to adnate, often attached to a thin, weak pseudocollarium best demonstrated in dried basidiomata. Stipe 8-60 mm long, central, insititious to not so, usually with distinct basal mycelium, hollow or lightly stuffed but not solid, glabrous, pubescent or furfuraceous, paler upward, downward dull greyish tan to reddish brown or dark brown or nearly black. Odor negligible or (usually) very distinct, like onion or garlic.

Habitat and distribution.

Saprophytic on decaying deciduous leaves, buried rotting wood, bark (including bark of living, standing trees) and in one species on mixed conifer detritus; distribution in Europe ( My. alliaceus , My. scorodonius , My. kallioneus , My. prasiosmus , My. subalpinus ), trans-Mediterranean ( My. virgultorum ) western and eastern North America ( My. applanatipes , My. olidus , My. salalis , My. scorodonius and f. diminutivus), Asia ( My. yunnanensis ) and Antipodes ( My. curraniae , My. cinnamomeus ).

Pileipellis a hymeniform layer of inflated hyphal termini sometimes with scattered broom cell-like pileocystidia especially at pileus margin; elements clamped, stalked, subglobose, obpyriform, deeply lobed, occasionally strongly pigmented, firm-to thick-walled, rarely with a few knobs or finger-like apical projections. Pleurocystidia present, from poorly differentiated to narrowly or broadly fusiform; contents homogeneous, sometimes vaguely partitioned. Basidia clavate, sometimes subcapitulate, (2-)4-sterigmate, often long, clamped; contents heterogeneous, appearing oily (PhC). Basidiospores either narrowly clavate (Qm = >3), or ellipsoid to broadly ellipsoid (Qm = <2.5), marasmioid, subamygdaliform or broadly ellipsoid. Cheilocystidia present, from undifferentiated from basidioles, cylindrical, clavate, subampulliform, lageniform, sometimes arbuscular with digitate outgrowths. Caulocystidia present or absent, often gathered into floccose clusters or synnematoid projections. Rhizomorphs unreported; telepods very rarely present on extra-European taxa only.

Mycetinis taxonomic outline:

1. Mycetinis alliaceus (Jacq.: Fr.) Earle. 1909. Bull. N.Y. Bot. Gard. 5: 414.

2. Mycetinis applanatipes (Desjardin) A.W. Wilson & Desjardin. 2005. Mycologia 97: 677.

3. Mycetinis cinnamomeus (Cleland) R.H. Petersen & Desjardin. (below)

4. Mycetinis copelandii (Desjardin) A.W. Wilson & Desjardin. 2005. Mycologia 97: 677.

5. Mycetinis curraniae (G. Stev.) J. A. Cooper & P. Leonard. 2012. Index Fungorum 3: no. 550026.

6. Mycetinis kallioneus (Huhtinen) Antonín & Noordel. 2008. Czech Mycol. 60: 26.

7. Mycetinis olidus (Gilliam) R.H. Petersen (below)

8. Mycetinis opacus (Berk. & M.A. Curtis) A.W. Wilson & Desjardin. 2005. Mycologia 97: 677.

9. Mycetinis prasiosmus (Fr.: Fr.) R.H. Petersen (below)

= Mycetinis querceus (Britzelm.) ss. Antonín & Noordel. 2008. Czech Mycol. 60: 26.

10. Mycetinis salalis (Desjardin) Redhead. 2012. Index Fungorum 8: 1.

11. Mycetinis scorodonius (Fr.: Fr.) A.W. Wilson & Desjardin. 2005. Mycologia 97: 678.

11A. Mycetinis scorodonius f. diminutivus R.H. Petersen, K. Dyson & J. Ammirati (below)

12. Mycetinis subalpinus (P.-A. Moreau) P.-A.Moreau & R.H. Petersen (below)

13. Mycetinis virgultorum ( Malençon & Bertault) R.H. Petersen (below)

14. Mycetinis yunnanensis R.H. Petersen (below)

Key to species of Mycetinis