Polyporales » Polyporales genera¬†incertae sedis » Gilbertsonia

Gilbertsonia angulopora

 

Gilbertsonia angulopora (M.J. Larsen & Lombard) Parmasto 2001, in Parmasto, Harvard Papers in Botany, 179-182 (2001).

Diagnosis: Basidiomata annual, resupinate, effused up to 40(-100) cm, usually easily removable from substrate, soft watery waxy when fresh, fragile, with very brittle tubes when dry; odor somewhat sour in fresh basidiomata. Subiculum thin, 0.3-1 mm, in case of very rotten wood in some places up to 5 mm thick, fragile-cheesy, chalky when dry, creamy-white, light yellowish cream when dry (Kornerup and Wanscher: 4 A 3-4; Munsell: 10 YR-2.5 Y 9/4). Margin thin, 0.5-1 mm, white, cream when dry (Kornerup and Wanscher: 4 A 3; Munsell: 2.5 Y 9/4), distinct, soon disappearing. Tubes (dissepiments) 3-10 mm long, when oblique up to 20 mm, rather thick, later with thinning edges, cheesy or soft waxy and fragile, light cream-color or almost white (Kornerup and Wanscher: 3 A 3; Munsell: 2.5-5 Y 9/3-4) when fresh, yellow ochre or brownish yellow, later sometimes almost brick red when dry (Kornerup and Wanscher: 5 B 6-7, later 7 D 7-8; Munsell: 7.5 YR 6-7/10, later 5 YR 5/8); pores angular, irregular, sometimes labyrinthine, (0.5-)0.7-1.2(-1.5) mm in diam., about 0.7-1 per mm, concolorous with tubes; dissepiments becoming lacerate.

Hyphal system dimitic; tube trama of densely intermingled somewhat parallel generative and binding hyphae. Generative hyphae distinct, thin-walled, branched, sometimes torulose, hyaline, 4-6 µm in diam, with (frequently medallion-like) clamps, infrequent in subicular context, numerous in the outer part of tube trama; binding hyphae thick-walled, with rare secondary simple septa, irregularly ramified, tortuose, not tapering to filiform tips, with sidebranches and sometimes dendroid tips, very brittle, 3-6 µm in diam, in some places inflated up to 10 µm, hyaline or slightly yellow, abundant in the context and in the central part of tube dissepiments. Subhymenium thin, not thickening; cystidioles rare, in some specimens absent, fusoid or rounded, sometimes with a small tubelike extension, 20-35 x 7-8 µm; basidia clavate, attenuated and with a clamp at base, 17-25 x 6.5-8.5 pin (up to 40 µm long according to Larsen and Lombard, 1983), in preparations easily breaking away, with four sterigmata 4-5 x 1-1.2 µm; spores broadly elllipsoid, with one side flattened, thin-walled, smooth, hyaline, 5.2-6.5 x (3.2-)3.5-4.5 µm. All parts of basidiome non-amyloid, non-dextrinoid. Causing brown cubical rot of dead wood.

Index Fungorum Number: IF491903