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Key of European species of Tomentella incl. Odontia
- spores size without ornaments - cyanescent-  hyphae and basidia bluish-green to bluish black in KOH
A- Hyphae clamped	1
B- Clamps absent or occasionally present	38
1a.   Cystidia present	2
1b.   Cystidia absent	8
2a.   Cystidia hyphoid 55-95 x 3-4 µm, growing from subiculum and rhizomorphs,
hymenophore hazel-brown to olive-brown, smooth to granulose,
margin byssoid with brownish dimitic rhizomorphs,
spores irregular 8,5-10 µm
Tomentella atroarenicolor Nikol. 1970
2b.   Cystidia acuminate, capitate or clavate	3
3a.   Cystidia acuminate (basally widened, rarely hyphoid)	4
3b. Cystidia capitate	5
3c. Cystidia clavate	6
4a.   Hymenophore  hazel-brown, granulose,
cystidia somewhat distended base and tapering towards the slightly,         expanded apices, often apical encrusted with brown deposits,
some spores reddish brown in KOH
Tomentella subtestacea Bourd. & Galz.1924
4b.   Hymenophore greyish-green, smooth to granulose, mucedinoid,
cystidia apical slightly incrusted
Tomentella galzinii Bourd. 1924
5a.   Cystidia pale brownish to greenish
basidiocarps separable, dimitic rhizomorphs present,
hymenophore yellowish-brown to olive-brown,
Tomentella pilosa (Burt) Bourd. & Galz. 1924
5b. Cystidia hyaline,
basidiocarps adherent, without rhizomorphs,
hymenophore greyish-green to olive-brown,
Tomentella viridula Bourd.& Galz.1924
6a.   Basidiocarps separable, rhizomorphs present,
hymenophore greyish-brown to hazel-brown, smooth, subicular hyphae brownish, thick-walled
Tomentella subpilosa Litsch 1960
(similar to T. muricata, an American species)
6b.   Basidiocarps adherent, rhizomorphs absent,
subicular hyphae hyaline and thin-walled	7
7a.   Spores irregular, partly lobed
Tomentella clavigera Litsch. 1960
7b.   Spores regular globose to ellipsoid,
subiculum thin to absent,
subhymenial hyphae partly short celled and inflated
Tomentella subclavigera Litsch. 1933
8a.   Spores average < 6,5µm	9
8b.   Spores average > 6,5 µm	13
9a.   Spores 3-4 µm,
hymenophore with short spines, rusty yellowish
Tomentella (Odontia) duemmeri (Wakef.) M.J. Larsen 1974
9b. Spores average 4,5-6,5 µm	10
10a.  Spores tubercular, hymenophore ferruginous-brown,
smooth to hydnoid, margin byssoid, rhizomorphs dimitic
Tomentella (Odontia) calcicola (Bourd. & Galz.) M.J. Larsen 1967
10b.  Spores echinulate	11
11a.  Basidiocarps adherent, rhizomorphs absent, hymenophore greyish brown
basidia up to 25 µm long
Tomentella griseoumbrina Litsch. apud Lundell & Nannf. 1936
11b. Basidiocarps separable, rhizomorphs present	12
12a. Hymenophore rosy brown, smooth
typical yellowish rhizomorphs present
Tomentella palliodocastanea X. Lu, Y.H. Mu & H.S. Yuan 2018
12b. Hymenophore greyish, granulose, rhizomorphs white
Tomentella cinerascens (P. Karst.) Hoehn. & Litsch. 1906
13a.  Spore ornaments bifurcate, Hymenophore hydnoid	14
13b.  Spore ornaments not bifurcate or with a view of bifurcate warts
Hymenophore smooth to granulare	15
14a.  Spores brown, slightly globose 7-8 µm, with short pines,
rhizomorphs dimitic
Tomentella (Odontia) crinalis (Fr.) M.J. Larsen 1967
14b.  Spores hyaline, irregular subglobose, 8-10 µm
rhizomorphs monomitic
Tomentella italica (Sacc.) M.J. Larsen 1967
15a.  Immaturity basidia vesicular up to 25 µm wide,
hymenophore smooth, fawn, basidiocarps compact,
spores irregular subglobose 7-9,5 µm
Tomentella terrestris (Berk. & Broome) M.J. Larsen 1974
15b.  Immaturity basidia clavat to utriform, < 15 µm wide	16
16a.  Spores average 6-7,5 µm (if hyphae short celled and inflated	17
(if hyphae partly short celled and inflated go to 32a)
16b.  Spores average larger	19
17a.  Subicular hyphae thick-walled, brown, incrusted, up to 6 µm wide,
hymenophore greyish-brown to dark brown, granulose,
spores partly irregular globose, 6-8 µm
Tomentella neobourdotii M.J. Larsen 1968
17b.  Subicular hyphae thin-walled, hyaline to pale brown	18
18a.  Basidia and hyphae strong cyanescent, hymenophore blackish brown,
rhizomorphs distinct, margin and subiculum ferruginous-yellowish
Tomentella botryoides (Schwein.) Bourd. & Galz. 1924
(if rhizomorphs dimitic and hymenophore olivaceous brown
comp. T. ferruginea 36a.)
18b.  Basidia and hyphae not cyanescent, rhizomorphs absent
hymenophore brownish, margin and subiculum same coloured,
spores not bifurcate
Tomentella sp. FD 7548
(?Tomentella microspora (P. Karst.) Höhn. & Litsch. 1906 ss. Ales Jirsa)
19a. Hymenophore whitish, yellowish or pale ochraceous to mustard yellow Tomentella ochraceo-olivacea Litsch. 1933           (Syn. Tomentella fatrensis Svrček 1958)
19b. Hymenophor pale to dark brown, olivaceous or rusty brown	20
20a.  Spores subglobose or ellipsoid, not lobed	21
20b.  Spores with irregular outline, mostly lobed	30
21a.  Spores ellipsoid (lateral view)	22
21b.  Spores subglobose (lateral view)	23
22a.  Subicular hyphae hyaline to pale brownish, thin-walled,
subhymenial hyphae short celled and inflated,
spores 7-10 µm long
Tomentella ellisii (Sacc.) Jülich & Stalpers 1980
22b.  Subicular hyphae brown, thick-walled,
subhymenial hyphae not short celled and inflated,
spores 8-12 µm long, partly irregular
Tomentella atramentaria Rostr. 1894
23a.  Subicular hyphae hyaline	24
23b.  Subicular hyphae brown	25
24a.  Hymenophore greyish-brown, tubercular, spores 8-11 µm,
basidiocarps separable, rhizomorphs present,
subiculum white, margin yellowish to white
Tomentella asperula (P. Karst.) Hoehn. & Litsch. 1906
24b.  Hymenophore pale brown to brick, spores 7-8,5 µm
(forms of T. lateritia 34a. and T. coerulea 35b. with more regular spores)
23a.  Hymenophor rust-yellowish, spores yellowish-brown	26
23b.  Hymenophor bright to dark brown or olive-greenish, spores brown	27
26a.  Spores with long spines, globose 8-11 µm,          apiculus amyloid Tomentella bryophila (Pers.) M.J. Larsen 1974
26b. Spores with short spines, irregular subglobose up to 6-9 µm,         apiculus not amyloid Tomentella ferruginella Bourd. & Galz. 1924
27a.  Hymenophore olive-greenish Tomentella viridescens (Bres. & Torr.) Bourd. & Galz. 1928
27b.  Hymenophor bright to dark brown	28
28a.  Spores globose, 8 -11 µm, spines up to 3 µm,
Subicular hyphae not incrusted
Tomentella stuposa (Link) Stalpers 1984 s. l. -- Spores 6 - 8 µm Tomentella spec. --      Spores 8 - 10 µm Tomentella stuposa (Link) Stalpers 1984 s. str. --      Spores 10 - 13 µm Tomentella bresadolae (Brinkmann) Höhn. & Litsch. 1908
28b.  Spores subglobose to ellipsoid, 7,5-9,5 µm, partly irregular	29
29a.  Subicular hyphae incrusted, apiculus not amyloid, with spines up to 2 µm
Tomentella lapida (Pers.) Stalpers 1984
(similar T. fuliginea with amyloid apiculus and subicular hyphae not incrusted) 29b.  Subicular hyphae not incrusted, with short spines, apiculus not amyloid Tomentella alpina Peintner & Dämmrich 2011
(alpine species on Salix herbacea)
30a.  Spores with long spines up to 2,5 µm, hymenophore smooth, fawn to rosy-buff,
margin byssoid to fimbriat, rhizomorphs present
Tomentella testaceogilva Bourd. & Galz. 1924
30b.  Not with the above combination of characters	31
31a.  Subhymenial hyphae to 8 (10) µm wide, short celled and inflated	32
31b.  Subhymenial hyphae to 5,5 µm wide, regular	33
32a.  Spores rough tuberculate-echinulate,                 a few warts bifurcate, mostly spores with oil drops,           margin often fimbriat, partly rhizomorphs present
Tomentella radiosa(P. Karst.) Rick 1934
(Syn. Thelephora terrestris f. resupinata Donk 1933)
32b.  Spores with long spines 7-9 µm,          hyphae to 10 µm wide, inflated up to 15 µm wide,
margin undetermined, rhizomorphs absent
Tomentella sublilacina agg.
33a.  Subiculum thin, rhizomorphs rarely,  basidia partly with reddish contents (examines in distilled water!)
hymenial with amber-tinted adhering material, solving in KOH          and partly cyanescent	34
33b.  Subiculum and rhizomorphs distinctly,
basidia not reddish in distilled water	36
34a.  Hymenophore brick-red, not cyanescent Tomentella lateritia Pat. 1894
34b. Hymenophore brownish	35
35a.  Hymeniophore dark brown, distinctly cyanescent
Tomentella molybdaea Bourdot & Galzin 1924 35b.  Hymenophore pale brownish, not cyanescent
Tomentella coerulea (Bres.) Hoehn. & Litsch. 1908 ss. M.J. Larsen
36a.  Basidia and hyphae cyanescent,
hymenophore ferruginous-brown to olive-brown, granulose,
margin partly yellowish, rhizomorphs dimitic
Tomentella ferruginea (Pers.) Pat. 1887
(Remarks: If hymenophore blackish-brown view Tomentella botryoides 19a.)
36b.  Basidia and hyphae not cyanescent	37
37a.  Hymenophore pale brownish with greenish or reddish tints, granulose, margin,          byssoid, ferruginous-brown, rhizomorphs monomitic or rarely dimitic
Tomentella punicea (Alb. & Schwein.) J. Schröt. 1889
37b.  Hymenophore ferruginous-reddish to chestnut-brown, smooth to tubercular,
margin ferruginous-reddish, rhizomorphs dimitic
Tomentella umbrinospora M.J. Larsen 1968
38a.  Spores ornaments bifurcate	39
38b.  Spores ornaments not bifurcate	40
39a.  Hymenophore tubercular to hydnoid, cinnamon brown,
spores slightly globose with short bifurcate ornaments 6-8 µm,
with thick-walled up to 200 µm long tramal pseudocystidia
Tomentella (Odontia) fibrosa (Berk. & Curtis) Köljalg 1996
39b.  Hymenophore smooth
(cf. Pseudotomentella!)
40a.  Spores brown	41
40b.  Spores hyaline (cf. Tomentellopsis!)
41a.  Occasionally clamps present,
subicular hyphae and subhymenial hyphae occasionally clamps present,          spores regular to irregular ellipsoid, 8-12 µm long, spines up to 1,5 µm Tomentella cinereoumbrina (Bres.) Stalpers 1993
41b.  All hyphae without clamps	42
42a.  Spores regular globose 7–9 µm,  spines up to 3 µm
Tomentella spinosispora Cizek  2004
(the type is described with clamps-bearing subicular hyphae, but now recognised as alien hyphae, E. Martini 2021)
42b.  Spores ellipsoid or irregular globose	43
43a.  Basidiocarps thick, crustose, mostly on soil
Tomentella fuscocinerea (Pers.) Donk 1933
(= Thelephora fuscocinerea Pers.)
43b.  Basidiocarps thin, tomentelloid, on wood	44
44a.  Spores with spines up to 2,5 µm, spores irregular globose,
basidiocarps mucedinoid
Tomentella badia (Link) Stalpers 1975
(if spores regular globose view 42a.)
44b.  Spores with spines up to 1,5 µm, spores regular ellipsoid
Tomentella cf. brunneofirma M.J. Larsen 1967