Hyphodontia palmae

Rick ex E. Langer, Bibl. Mycol. 154: 177.

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Synonyms:

= Odontia palmae Rick 1959, Iheringia 5: 163.
Lectotype: Brazil, S. Salvador, on palm rachis, leg. S. Rick, 1944, No. 22701, Herbarium PACA, O.

Macromorphology:

Resupinate, odontioid, ochraceous (herbarium specimens), margin thinning out, without aculei up to ca. 1 mm thick, aculei up to ca. 1 mm long, in longitudinal section with optuse tip, very densely standing.

Micromorphology:

Spores:
4-5.5 x 2.5-3 µm, cylindrical to slightly allantoid, thin-walled, smooth, inamyloid, without droplets (in herbarium specimens).
Basidia:
9-13 x 3.5-5 µm, young clavate, mature shortly compact or cylindrical to suburniform with one constriction and one basal clamp each.
Sterigmata:
Four, 2.5 µm long.
Cystida:
Tubular tramacystidia, up to ca. 1000 µm long, up to 14 µm in diameter, thick-walled (up to 1.5 µm). They arise from the subiculum. They are thin-walled ca. 30-50 µm from the top and may be incrusted with granulare exsudat, which is slowly soluble 5% KOH solution.
Hyphae:
Hyphal system monomitic. Basal hyphae loosely branched, 3-4 µm in diameter, slightly thick-walled (up 0.5 µm). Subhymenial hyphae 2-4 µm in diameter, thin-walled. In the subhymenium often collapsed basidia present.
Aculei:
The aculei are often fertile up to the top. There centre is built by parallel running hyphae and tramacystidia.

Habitate and substrate:

Tropical, palm rachis.

Biogeography:

Hitherto there is only meterial known which was collected by Rick in Brasilia.

Remarks:

H. palmae could be distingushed from H. microspora and H. orasinusensis in two points: spores size and presence of clamps at basal hyphae:
H. palmae H. microspora H. orasinusensis
Spores: 4-5.5 x 2.5-3 µm 2.5-4.5 x 1.5-2.5 µm 3.5-5 x 2.5-3.5 µm
Clamps at basal Hyphae: present present lacking
Hjortstam & Ryvarden (1982) state in their reinvestigation of the type that H. palmae not could be distingushed from H. microspora. Their statements of the spores size differs 1µm for the specimen Rick No. 22701 compared with my own measurements. H. palmae and H. microspora could at least be distinguished by their spores size.

Spores shorter than 4.5 µm
  Spores more narrow than 2.5 µm.................H. microspora
  Spores wider than 2.5 µm 
    Clamps at septa of basal hyphae present......H. palmae
    Clamps at septa of basal hyphae not present..H. orasinusensis
Spores longer than 4.5 µm
  Aculei up to 3 mm long, on deciduous wood......H. barba-jovis
  Aculei at most 1 mm long, on coniferous wood...H. abieticola

Herbarium specimens:

Brazil, S. Salvador, on palm rachis, leg. S. Rick, 1944, No. 22701, Herbarium PACA, O.

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Dr. Ewald Langer - 28. Febr. 1996
ewald.langer@uni-tuebingen.de