Pleosporales » Dictyosporiaceae » Dictyosporium

Dictyosporium zhejiangense

Dictyosporium zhejiangense Wongs., H.K. Wang, K.D. Hyde & F.C. Lin

 

Mycobank number: No. 515250

Etymology: zhejiangense, in reference to the Province where the type was found

Holotype: HMAS 196817

 

Sexual morph: Undetermined. Asexual morph: Colonies on natural substratum in the form of compact sporodochia, dark brown to black. Mycelium mostly immersed in substratum, composed of branched, septate, subhyaline to pale brown, smooth hyphae. Conidiophores pale brown, micronematous, mononematous, smooth, septate, branched, flexuous, cylindrical. Conidiogenous cells integrated, terminal, determinate, cylindrical, doliiform, subhyaline to pale brown. Conidial secession rhexolytic. Conidia acrogenous, solitary, cheiroid, smooth-walled, 25–35 × 17–24 μm (average = 30 × 20 μm, n = 30), brown, complanate, slightly constricted at the septa, consisting of 23–37 cells arranged mostly in 5 rows (rarely 4 rows). The two outer rows are usually shorter, the three central rows are darker than the outer rows, and the cells at the apical portion of the three central rows are swollen. The apical cells of each outer row are provided with 1–3 appendages which are thin-walled, subhyaline, 2–10 celled, smooth, 29–54 × 5.5–8 μm, variable in shape, constrict at the septa. The appendages were frequently detached from conidia under slightly pressure and were absent in dried specimens. (Wongsawas et al. 2009)

 

Colonies on potato dextrose agar (PDA) growing slowly reaching 3.5 cm diameter at 25°C in 4 months. Mycelium cottony, white to pale orange, mostly superficial on the agar, composed of branched, septate, smooth, hyaline hyphae, 1.5–3 μm wide, producing an orangish-brown soluble pigment in the medium. Sporodochia slightly, irregularly, dark brown to black, scattered at the edge of colony. Conidiophores light brown to brown, micronematous, mononematous, smooth, septate, branched and cylindrical. Conidiogenous cells integrated, terminal, determinate, cylindrical, doliiform, subhyaline to pale brown. Conidial secession rhexolytic. Conidia acrogenous, solitary, cheiroid, smooth-walled, 27–37 × 19–24 μm (average = 31 × 21 μm, n = 30), brown, complanate, slightly constricted at the septa, consisting of 22–33 cells arranged in 4-5 rows. (Wongsawas et al. 2009)

 

Material examined: CHINA, Zhejiang Province, Lishui City, Songyang County, on submerged wood, 24 October 2007, Wang H.K. & Wongsawas M., HMAS No. 196817.

 

Freshwater distribution: Zhejiang, China (Wongsawas et al. 2009)

 

References

Wongsawas M, Wang HK, Hyde KD, Lin FC (2009) Dictyosporium zhejiangense sp. nov., a new freshwater anamorphic fungus from China. Cryptogam Mycol 30:355–362

 

Figs 1-5. Micrographs of Dictyosporium zhejiangense (from holotype). 1. Sporodochia on natural substratum, 2. Colonies and sporodochia on potato dextrose agar, 3. Conidia, conidiogenous cells and conidiophores on potato dextrose agar, 4. Conidia with appendages from woody substrata, 5. Shapes of appendages. Scale bars: 1–2 = 200 μm, 3–5 = 10 μm. (Wongsawas et al. 2009)

 

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