Pleosporales » Dictyosporiaceae » Digitodesmium

Digitodesmium bambusicola

Digitodesmium bambusicola L. Cai, K. Q. Zhang, McKenzie, W. H. Ho & K. D. Hyde

Etymology: From Latin for bamboo and -cola, meaning living on bamboo.

 

Sexual morph: Undetermined. Asexual morph: Conidiomata sporodochial, pulvinate, grey when immature, dark brown to black when mature, non-punctiform and widely spreading. Mycelium mostly immersed in the substratum, composed of brown, smooth, thin-walled, septate, branched hyphae. Conidiophores semi-macronematous, mononematous, pale brown, smooth, thin-walled, unbranched, cylindrical, flexuous, 15–23 × 3–4 µm. Conidiogenous cells monoblastic, integrated, terminal, determinate, pale brown, smooth, thin-walled, non-proliferating. Conidia acrogenous, holoblastic, solitary, pale brown, cheiroid, 24–29–32.5 × 12.5–17–23 µm (averages for n = 25), euseptate, consisting of 3 arms which are united by a brown, 3–4 µm wide, truncate basal cell, mostly separating at the apex; arms discrete,  unbranched,  cylindrical,  20–28 × 4.5–6 µm, 4–7-euseptate, with conspicuous pores in the septa; conidia sometimes provided with apical or subapical appendages on the arms; appendages hyaline, thin-walled, globose to subglobose or clavate, 5–17 × 5–9 µm. Conidial secession schizolytic. (Cai et al. 2002)

 

Culture characteristics: Colonies on potato-dextrose agar slow-growing, reaching up to 5 mm diam in 2 weeks at room temperature (appr. 28°C), superficial, woolly, aerial mycelium copious, pale orange to orange from above; reverse pale orange in the centre, pale yellow towards the margin, margin regular. Hyphae 2-3 µm wide, pale yellow, septate, branched and smooth-walled.

 

Material examined: Holotype: The PHILIPPINES: Negros Occidental, Bario Alegria, Liput River, Philippines Centre for Mycological Research, on submerged bamboo culms, 18 Aug. 2001, V.A. Hyde (PDD 74494). Paratype: Same origin: HKU(M) 16491, 16492, 16493, 16494, and 16495.

 

Freshwater distribution: Philippines (Cai et al. 2002)

 

References

Cai L, Zhang KQ, McKenzie EHC, Ho WH, Hyde KD (2002) Acrodictys liputii sp. nov. and Digitodesmium bambusicola sp. nov. from bamboo submerged in the Liput River in the Philippines. Nova Hedwigia 75:525–532

 

Figs 9-16. Digitodesmium bambusicola, holotype. 9. Colonies on sub stratum, 10. Squash mount of sporodochium, 11-16. Conidia. Appendages are illustrated in 12, 13, 15 and 16. Scale bars: 9 = 200 µm; 10-16 = 10 µm. (Cai et al. 2002)

 

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