Agaricales » Marasmiaceae » Brunneocorticium

Brunneocorticium pyriforme

Brunneocorticium pyriforme Sheng H. Wu 2007, in Wu et al., Mycologia, 99(2), 302-309 (2007).

Etymology. From pyriformis (5pear-shaped), referring to the shape of the basidiospores.

Diagnosis: Basidiocarp resupinate and effuse, 120–220 µm thick, initially appearing as small brown dots composed of abundant skeletal hyphae. Later a white fertile region developes at center of dot. White fertile zone broadening during growth of basidiocarp, eventually leaving a narrow brown sterile zone at the margin. Hymenial surface of mature basidiocarp white or whitish, smooth, cracked; margin brown, abrupt.Hyphal system dimitic; generative hyphae nodoseseptate. Subiculum brown, due to presence of abundant yellowish-brown skeletal hyphae, generally not dense in texture. Subicular generative hyphae

colorless, rare and usually difficult to detect, 1.5–3 µm diam, thin-walled; subicular skeletal hyphae abun abundant, yellowish-brown or brown, occasionally branched, 1.5–4.5 µm diam, generally thick-walled and rarely thin-walled. Hymenium thickening, differentiated from the subiculum, that is of dense texture, usually with numerous amorphous, colorless, excreted material; hyphae mainly vertical, colorless, usually glued together and indistinct, thin-walled. Leptocystidia not abundant, difficult to detect in some collections, cylindrical, occasionally flexuous, colorless, often bearing secondary septa, 35–80 × 4–9 µm, thin- or slightly thick-walled. Basidia subclavate with a median constriction, 45–55 ×7–8 µm, 2- sterigmate. Basidiospores pyriform, bearing a minute apiculus, smooth, thin-walled, usually guttulate, colorless,10–13 × 5.5–7 µm, IKI–, CB–.

Index Fungorum Number: IF505728

Figures 1–6. Brunneocorticium pyriforme (holotype). 1. Basidiocarp section. 2. Skeletal hyphae. 3. Generative hyphae. 4. Leptocystidia. 5. Basidia. 6. Basidiospores. Bars =10 mm.

 

Figure 7. Brunneocorticium pyriforme (holotype). Mycelium after 6 weeks growth on 1.5% MEA at 25 degrees.

 

 Figure 8. One of the two most parsimonious trees of partial nuclear large subunit rDNA sequences. Bootstrap values are shown at nodes supported by more than 50% from 1000 replications.

 

Reference:

Wu, S. H., Wang, D. M., & Tschen, E. (2007). Brunneocorticium pyriforme, a new corticioid fungal genus and species belonging to the euagarics clade. Mycologia, 99(2), 302-309.

 

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