A key to 28 accepted species of Lyomyces
1a. Hymenophore verrucose, grandinioid or odontioid................................................................................................................	2
b. Hymenophore smooth or slightly grandinioid.........................................................................................................................	13
2a. Subulate cystidia present, sometimes apically with a small capitate structure.....................................................................	3
b. Subulate cystidia absent.................................................................................................................................................................	7
3a. Capitate cystidia present..........................................................................................................................................	L. macrescens
b. Capitate cystidia absent, very few subcapitate cystidioles possible.........................................................................................	4
4a. Subulate cystidioles only laterally in aculei..............................................................................................................	L. stratosus
b. Subulate cystidia in hymenium....................................................................................................................................................	5
5a. Subulate cystidia apically not capitate........................................................................................................................	L. juniperi
b. Subulate cystidia sometimes apically capitate............................................................................................................................	6
6a. Hymenophore young grandinioid, odontioid when older, white to yellowish or cream; basidiospores narrowly ellipsoid to cylindrical, sometimes slightly allantoid...........................................................................................	L. crustosus
b. Hymenophore partly fine aculeate, white to pale greyish; basidiospores cylindrical....................................	L. vietnamensis
7a. With septocystidia, capitate cystidia and transitional forms........................................................................................	L. albus
b. Without septocystidia....................................................................................................................................................................	8
8a. Basidiospores globose, 4–5 μm in diam, verrucose, slightly thick-walled..........................................................	L. griseliniae
b. Basidiospores ellipsoid, smooth, thin-walled.............................................................................................................................	9
9a. Basidiospores less than 3.5 μm wide........................................................................................................................................	10
b. Basidiospores more than 3.5 μm wide.......................................................................................................................................	11
10a. Basidiospores less than 5.5 µm long; capitate cystidia present...............................................................	L. microfasciculatus
b. Basidiospores mostly more than 5.5 µm long; capitate cystidia absent...................................................................	L. stratosus
11a. Hymenophore odontioid, margin abrupt..............................................................................................................................	12
b. Hymenophore grandinioid, margin thinning out......................................................................................	L. capitatocystidiatus
12a. Hyphae with a lot of crystals...................................................................................................................................	L. fimbriatus
b. Hyphae without crystals.....................................................................................................................................................	L. pruni
13a. Basidiospores mostly more than 5.5 μm wide....................................................................................................	L. incrustatus
b. Basidiospores less than 5.5 μm wide..........................................................................................................................................	14
14a. Basidiospores suballantoid to reniform..................................................................................................................	L. eburneus
b. Basidiospores not reniform.........................................................................................................................................................	15
15a. Generally with two or rarely three sterigmata................................................................................................	L. bisterigmatus
b. Generally with four sterigmata...................................................................................................................................................	16
16a. Hymenophore margin abrupt.................................................................................................................................................	17
b. Hymenophore margin thinning out...........................................................................................................................................	24
17a. Capitate or subcapitate cystidia present................................................................................................................................	18
b. Capitate or subcapitate cystidia absent......................................................................................................................................	23
18a. Basidiospores cyanophilous....................................................................................................................................................	19
b. Basidiospores acyanophilous......................................................................................................................................................	22
19a. Submoniliform cystidia present..........................................................................................................................	L. mascarensis
b. Submoniliform cystidia absent, tapering cystidia present..................................................................................................	20
20a. Tapering cystidia more than 40 μm long............................................................................................................	L. bambusinus
b. Tapering cystidia less than 40 μm long..................................................................................................................................	21
21a. Fusoid cystidioles present...........................................................................................................................	L. wuliangshanensis
b. Fusoid cystidioles absent............................................................................................................................................	L. cremeus
22a. Basidiospores mostly less than 5 μm long.................................................................................................................	L. gatesiae
b. Basidiospores more than 5 μm long............................................................................................................................	L. orientalis
23a. Fusiform or cylindrical hyphidia-like cystidia present.......................................................................................	L. organensis
b. Subulate cystidia present................................................................................................................................................	L. juniperi
24a. Basidiospores mostly more than 6.5 µm wide..................................................................................................	L. macrosporus
b. Basidiospores less than 6.5 µm wide..........................................................................................................................................	25
25a. Capitate cystidia absent...........................................................................................................................................................	26
b. Capitate cystidia present..............................................................................................................................................................	28
26a. Basidiospores more than 7 μm long..................................................................................................................	L. allantosporus
b. Basidiospores less than 7 μm long..............................................................................................................................................	27
27a. Basidiospores cyanophilous...................................................................................................................................	L. elaeidicola
b. Basidiospores acyanophilous......................................................................................................................................................	29
28a. Hymenophore smooth; capitate cystidia; hyphae usually with a lot of crystals..................................................	L. sambuci
b. Hymenophore first for a long time porose-reticulate, later smooth; hyphae usually without crystals...................	L. erastii
29a. Leptocystidia present...............................................................................................................................................................	30
b. Leptocystidia absent.....................................................................................................................................................................	31
30a. Leptocystidia slightly fusiform, not encrusted, thin-walled, more than 5 µm wide; hyphae up to 4 µm in diam...........................................................................................................................................................................	L. boninensis
b. Leptocystidia not fusiform, encrusted with crystals, thin- to slightly thick-walled, mostly less than 5 µm wide; hyphae up to 5.5 µm in diam........................................................................................................................................	L. leptocystidiatus
31a. Hymenophore very finely aculeate...................................................................................................................	L. vietnamensis
b. Hymenophore fairly smooth...................................................................................................................................	L. tenuissimus