Hyphodontia alba
Wu, Acta Bot. Fenn. 142: 85.
Holotype:Taiwan, Taitung, Taimali, on a fallen twig of an angiosperm tree , ca. 850 m alt., leg. S.-H. Wu, Wu 89 05 19 - 19, Herbarium TAI.
Select illustrations:
![[image]](alba1i.gif)
Macromorphology:
Resupinate, odontioid, white, Aculei up to 50 µm high, margin thinning out.
Micromorphology:
- Spores:
- 4.5-5 x 3 µm, elipsoid, thin-walled, smooth, hyalin, inamyloid, with one droplet each.
- Basidia:
- 12-15 x 3.5-4 µm, suburniform, with one basal clamp each.
- Sterigmata:
- Four, 2.5 µm long.
- Cystidia:
- 1. Septocystdia, ca. 100 x 7-8 µm, thick-walled, apex thin-walled. The clamps at the septa grow out by chance.
- 2. Capitate and thin-walled cystidia, ca. 40 x 5-8 µm.
- 3. Intermediate forms of 1. and 2.
- Clamps:
- All primary septa with one clamp each.
- Hyphae:
- Hyphal system monomitic. Subhymenial hyphae 2-3 µm in diameter, thin-walled, very dense hyphal branching. Subicular hyphae 4-5 µm in diameter, thick-walled, very loosely hyphal ramification. Hyphal branching mostly by outgrowing of clamps or subseptal outgrowing. In water mounted slides all parts of the subhymenium are covered with slowly soluble crystals.
- Aculei:
- The aculei are built by clustered cystidia.
Habitate and substrate:
The only two collections I could examine are from warm temperate areas.
Biogeography:
Taiwan and Italy are the hitherto known locations. Therefore no definite interpretations on biogeography can be made.
Remarks:
H. alba, H. pallidula and H. alutaria have a similar micromorphology. But septocystidia in combination with capitate cystidia and intermediate forms of these are only found in H. alba. Hassan and David (1983) have shown that H. pallidula and H. alutaria can not be crossed in mating test although they are very similar. The intermediate forms of septocystidia and capitate cystidia a good reason to delimit H. alba from the latter species.
Herbarium specimens:
Taiwan, TaitungTaiwan, Taitung, Taimali, on a fallen twig of an angiosperm tree , ca. 850 m alt., leg. S.-H. Wu, Wi 89 05 19 - 19, Herbarium TAI.
Italy, Livorno, Giardini, on deciuous wood, leg. A. Bernicchia, 27.10.1982, Herbarium O.
Go to:
Dr. Ewald Langer - 4. March 1996
ewald.langer@uni-tuebingen.de