1.Hyphae with clamps 2
1.Hyphae without clamps 15
2.Clamps inconstant 3
2.Clamps constant 8
3.Basidia without basal clamps, clamps only on some septa of the basal
hyphae B. pandani
3.Basidia with basal clamps 4
4.Spores broad-navicular, limoniform [Fig. 23-31] 5
4.Spores narrow-navicular or ellipsoid to ovoid 6
5.Basidia 35-40 x 10-12 µm; spores 12-13 x 7 µm B. grandisporum
5.Basidia 10-20 x (5)-8-10 µm; spores 9-12 x 5-6.5 µm B. medium
6.Spores ellipsoid to ovoid, 6-7 x 3-4 µm B. arachnoideum
6.Spores narrow-navicular, acuminate, 6-10 x 1.5-3 µm B. angustisporum
8.Basidiocarp with cystidia [Fig.] 9
8.Basidiocarp without cystidia 12
9.Basidiocarp with chlamydospores [Fig. k,l] and with two-celled
subulate cystidia [Fig. k,l] B. parvisetosum
9.Basidiocarp without chlamydospores, with obtusee, tubular cystidia 10
10.Basidiocarp grandinioid; spores 6-9 x 3-4 µm; hymenium strongly
encrusted B. grandinioides
10.Basidiocarp hypochnoid to pilos 11
11.Basidia 17-29 x 7-10 µm; spores 8-10 x 4-5 µm, hyphae und Cystiden
not encrusted B. ansosum
11.Basidia 15-20 x 5-6,5 µm; spores 4.5-6 x 2.5-3 µm; hyphae and
cystidia slightly encrusted B. pilosellum
12.Basidia short-cylindrical to slightly stipitate, 12-17 x 7-9 µm;
spores. bananiform [Fig. 10], 7.5-11 x 2-3 µm B. bananisporum
12.Basidia suburniform, spores ovoid or navicular 13
13.Spores navicular [Fig. 1] 6.5-9 x 2.5-3.5 µm;
basidia 10-30 x 5-9 µm B. subcoronatum
13.Spores ellipsoid to ovoid 14
14.Spores ovoid [Fig. 34-35], 5-7-(8) x 3-4 µm; hyphae usually
yellowish to brownish B. olivaceum
14.Spores ellipsoid to ovoid [Fig. 38], 6-7 x 3-4 µm; hyphae usually hyaline
to pale yellowish B. arachnoideum
15.Basidiocarp with tubular cystidia [Fig. 7] 16
15.Basidiocarp without tubular cystidia 18
16.Basidia (8)-9-12 x 5-5.5 -6 µm; spores 4.5-7 x 2-3 µm B. piliferum
16.Basidia 15-25 x 6-11 µm 17
17.Spores 7.5-8.5 x 3-4 µm B. tubulicystidium
17.Spores 10-11.5 x 4-4.5 µm B. digitatum
18.Spores laciniat; basidia 13-16 x 7-8 µm, 6-spored B. lacinisporum
18.Spores smooth, echinulate or rough ornamented 19
19.Basidia usually 6-8-sporig 20
19.Basidia usually 2-4-spored 34
20.Spores ellipsoid to ovoid 21
20.Spores broad-ovoid or subglobose to globose [Fig. 41-42] 25
20.Spores navicular, biapiculate or subcylindrical 26
21.Spores in light microscopy smooth 22
21.Spores in light microscopy rough ornamented[Fig. 45-50] 24
22.Hyphae strongly rough ornamented B. pruinatum
22.Hyphae smooth or basally slightly ornamented 23
23.Spores 8-12 x 4-6 µm; basidia 18-27 x 8-12 µm B. obtusisporum
23.Spores 5-8 x 2.5-4 µm; basidia 13-22 x 6-9 µm B. laeve
24.Spores ellipsoid to ovoid, 5,2-6,7(7) x 3,2-4,3 µm,
slightly thick-walled B. stigmatisporum
24.Spores ellipsoid to subglobose, 4.5-5.5 x 3.5-4.5 µm,
distinctly thick-walled B. asperulum
25.Hyphae slightly ornamented; spores 4-6.5 x 3.5-5 µm,
globose to subglobose B. sphaericosporum
25.Hyphae not ornamented; spores 5.5-7.5 x 4-6 µm,
subglobose to broad-ovoid B. subalbidum
26.Spores broad-navicular, biapiculate [Fig. 24-31] 27
26.Spores subcylindrisch to long-navicular [Fig. 18,19] 28
26.Spores narrow-navicular to navicular 30
27.Basidia 15-25 x (7.5) 9-12 µm, 1-6-spored;
spores 8-12 x 4-6,5 µm B. vagum
27.Basidia 13-20 x 7-10 µm;
spores 6-9 x 3-4 µm B. robustior
27.Basidia 12-15-(18) x 5-8 µm, 6-spored;
spores 6-8 x 3-4 µm B. candicans
27.Basidia 12-15 x 7-9,5 µm, 6-8-spored;
spores 7.5-10 x 4-6 µm B. latispora
27.Basidia 12-18 x 7-9 µm, 6-8-spored;
spores 9-10 x 4-4.5 µm B. chilense
27.Basidia 9-16 x 7-9 µm, 4-6-spored;
spores 9-10 x 3-5 µm B. subbotryosum
28.Spores 12-18.5 x 4-5 µm; basidia 15-20 x 8-12 µm;
basal hyphae thick-walled B. danicum
28.Spores 11-13 x 10-13 µm; basidia 18-25 x 9-11 µm; basal hyphae thin-
to slightly thick-walled, cell wall up to 0.5 µm B. longisporum
30.Subhymenial hyphae short-septate and barrel-shaped (G. Langer 1994, Fig. 62),
basidia seldom longer than 15 µm and barrel-shaped [Fig. v-x]. 31
30.Subhymenial hyphae neither short-septate nor barrel-shaped,
basidia usually longer than 15 µm, subcylindrical to slightly
stipitate or mature slightly constricted (G.Langer 1994, Fig. 52). 32
31.Basidia 12.5 -17.5 x 8.5-12.5 µm, 2-6-spored;
spores 9-12 x 3.5-5 µm B. croceum
31.Basidia 11-15 x 7.5-8 µm, 6-8-spored;
spores 7.5-9.5x 2.5-3.5 µm B. curtisii
31.Basidia 10-12.5 x 6.5-8.5 µm, (4)-6-8-spored;
spores 8-13 x 3-4 µm B. simile
31.Basidia 9-12 x 7-9 µm, 6-8-spored;
spores 7-9 x 2.5-3.5 µm B. lembosporum
32.Spores apicaly acuminate, 9-11 x 3.5-4 µm,
basidia 15-20 x 7-10 µm B. sordidulum
32.Spores usually apicaly obtuse, 6-10 µm long 33
33.Basidia 12-18-(20) x 7.5-9-(10) x 3-4.5 µm B. aureum
33.Basidia 12-15 x 8B. aureum
33.Basidia 12-15 x 8-9 µm, 6-spored; spores 7-9.5 x 2.5-4 µm B. conspersum
33.Basidia 12.5 -19 x 7-9 µm, 4-8-spored; spores 8-9.5 x 3.5-4.5 µm B. ellipsosporum
34.Spores smooth, globose, hyalin, slightly thick-walled [Fig. 43] B. globosporum
34.Spores ornamented 35
35.Spores asperulate, globose to ellipsoid [Fig. 45] 36
35.Spores echinulate to aculeate, globose to subglobose [Fig. 51-53] 38
36.Hyphae encrusted, spores ovoid to subglobose, 5.5-8 x 4-5 µm B. verrucisporum
36.Hyphae not encrusted 37
37.Spores ellipsoid, 6-7 x4-4.5 µm B. tuberculisporum
37.Spores globose, 4.5-5.5 x 4-5 µm B. microverrucisporum
38.Basidia 2-spored B. bisporum
38.Basidia usually 4-spored 39
39.Spores polyechinulate, spines straight, up to 3 µm long [Fig. 53] B. isabellinum
39.Spores few and broad- or long-echinulate, spines often curved and longer than 3 µm 40
40.Spores 8-13 x 7-12 µm, long-echinulateto aculeate B. bondarzevii
40.Spores 4-6 x 4-5 µm, aculeate B. asterosporum
Key for the anamorphs of
Botryobasidium
(Haplotrichum, Allescheriella)
1.Conidia fusoid (Fig. 55a-c) 2
1.Conidia globose to ellipsoid [Fig. d-j]; hyphae and conidiophors without clamps 4
2.Hyphae seldom with clamps; conidiophors without clamps;
conidia 15-25 x 6-8 µm H. medium
2.Hyphae and conidiophors without clamps 3
3.Conidia 23-45-(70) x (5)-7-10-(13) µm B. latisporum
3.Conidia 23-40 x 7-10 µm B. longisporum
4.Conidiophors if branched, than only basally, without vesicular conidio-
genuous celles; conidia not in acropetal chains 5
4.Conidiophors often also apically branched, with vesicular conidio-
genuous celles 7
5.Conidia produced single and terminal at the conidiophors, 19-28 x 15-20 µm,
thick-walled [Fig. h] Allescheriella crocea
5.Conidia produced laterally or terminally from conidiogenuous teeth of
the e onidiophors, thin- to slightly thick-walled[Fig. f] 6
6.only few conidiogenuous teeth on the two last apical cells of the
conidiophors; conidia (18)-20-25 x 10-13 µm H. ellipsosporum
6.numerous conidiogenuous teeth on the 3-4 apical cells of the
conidiophors; conidia 13-19-(22) x 9-13 µm H. conspersum
7.Conidia globose to subglobose or broad-ellipsoid, single or in acropetal chains 8
7.Conidia ellipsoid to limoniform, single or in acropetal chains 11
8.Conidia globose, yellowish, slightly thick-walled and rough ornamented
(SEM), cell wall up to 0.5 µm, 8-16 µm in diameter;
conidiophors seldomwith anastomoses H. curtisii
8.Conidia globose bis broad-ellipsoid, mature dark rusty-brown or
yellowish, thick-walled, cell wall up to 1.5 µm, with granular content;
cell wall of the conidia seems to be lamellate in light microscope,
conidia surface e ooth; conidiophors often with anastomoses 9
9.Conidia production single, not in acropetal chains; conidia subglobose
to broad-ellipsoid, 13-17.5 x 13-15 µm, with a distinct papilla H. rubiginosum
9.Conidia production in acropetal chains 10
10.Conidia subglobose to broad-ellipsoid, mature dark rusty-
brown, 17-25 x 14-22 µm, with one or two distinct papillae; Conidia
production in long acropetal chains; conidiophors either 1-2-cellular,
thin-walled and hyaline to yellowish, or multicellular, slightly
thick-walled, and yellowish to brownish H. simile
10.Conidia globose, mature yellow, 11-16 x 12.5-14 µm, with one or two
faint papillae; conidiophors multicellular, thin-walled, and hyaline
to yellowish H. tomentosum
11.Conidia surface rough; conidia ellipsoid bis broad-ellipsoid, yellowish,
mature slightly thick-walled (cell wall up to 1 µm), 11-18 x 9-12 µm;
only few faint conidiogenuous teeth per conidiogenuous cell; colony
whitish to pale yellowish or cream-coloured H. chilense
11.Conidia surface smooth 12
12.Conidia ellipsoid, pale yellowish, mature slightly thick-
walled,13-16-(19) x 8-10 µm, cell wall up to 1 µm; colony whitish to
pale yellowish or cream-coloured; conidiogenuous teeth per conidio-
genuous cell H. candicans
12.Conidia ellipsoid to limoniform, yellowish, mature thin-walled to
slightly thick-walled, cell wall up to 0.5 µm, 20-30 x 10-14.5 µm;
colony yellowish to orangeocker or rusty-brown; with one up to three
conidiogenuous teeth per conidiogenuous cell H. aureum
Responsibility: Ewald Langer
ewald.langer@uni-tuebingen.de - 14.Nov.1995