Hyphodontia knysnana

(van der Bijl) Reid 1973
Il. S. Afr. Bot. 39(2): 175.

Select illustration:

[image]

Synonyms:

= Odontia knysnana van der Bijl 1934, Annale Univ. Stellenbosch 12(A1): 9.
Holotype: South Africa, Afrikaans, Knysna, on decaying wood, leg. P.A. van der Bijl, Jan. 1924, No. 1332, Herbarium PRE.

Macromorphology:

Resupinate, odontioid, cream-coloured, margin distinct, without aculei up to ca. 150 µm thick, aculei up to ca. 100 µm high, 6-8 aculei per mm, apically fimbriate.

Micromorphology:

Spores:
5.5-6 x 3-4 µm, ellipsoid up to cylindric, smooth, inamyloid, thin-walled, with one droplet each.
Basidia:
15-20 x 4-5 µm, suburniform, with 1 up to 2 constrictions and one basal clamp each.
Sterigmata:
Four, 3 µm long.
Clamps:
All primary septa with one clamp each.
Cystidia:
Subulate cystidia with long tapering tops, up to 75 µm long, basal up to 4-5 µm in diameter, apical 1-2 µm in diameter, thin-walled, sometimes basally incrusted with little crystals (1-2 µm big). They arise from the subhymenium with one basal clamp each.
Hyphae:
Hyphal system monomitic. Basal hyphae 2-3 µm in diameter, slightly thick-walled (up to 0.5 µm). Subhymenial hyphae 1.5-3 µm in diameter, thin-walled, strongly incrusted with little crystals (1-2 µm big), which are soluble in 5% KOH solution.
Aculei:
Subulate cystidia may be clustered in groups and form the aculei.

Habitate and substrate:

Decaying wood. Unfortunatelly there are no references about the habitate.

Biogeography:

Until now only specimens from South africa and Argentinia (Hjortstam 1986).

Remarks:

H. knysnana could be easily mixed up with H. nudiseta. But both species however could be distingushed by very tiny differences. The spores form, the basal diameter of the cystidia and the basidia, which may have several constrictions (galzinioid) in H. nudiseta, are very important for their delimitation:

H. knysnana H. nudiseta
Spore size: 5.5-6 x 3-4 µm 4.5-6 x 3-4.5 µm
Spore form: ellipsoid to cylindric subglobos up to ellipsoid
Basidia: 1 to 2 constrictions several constrictions
Cystidia: basal 4-5 µm in diam. basal up to 7 µm diam.
and up to 75 µm long and up to ca. 50 µm long

Herbarium specimens:

South Africa, Afrikaans, Knysna, on decaying wood, leg. P.A. van der Bijl, Jan. 1924, No. 1332, Herbarium PRE.
Tanzania, Arusha Prov., Arusha National Park, Mt. Meru, southern slope, road to the crater, 1800-2300 m alt., 3°14´S 36°47´E, leg. L. Ryvarden, 08.02.1973, LR 10126, Herbarium O.

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Dr. Ewald Langer - 27. Febr. 1996
ewald.langer@uni-tuebingen.de