Savoryellales » Savoryellaceae » Canalisporium

Canalisporium dehongense

Canalisporium dehongense W. Dong, H. Zhang & K.D. Hyde. Fungal Diversity 96: 159 (2019)

Index Fungorum number: IF555407         Facesoffungi number: FoF05058

 

Saprobic on decaying wood submerged in freshwater. Sexual morph: Undetermined. Asexual morph: Conidiomata sporodochial, scattered, punctiform, pulvinate, granular, black, shiny. Mycelium immersed in natural substrate, consisting of branched, septate, thin-walled, smooth, hyaline to pale brown hyphae. Conidiophores up to 65 μm long, micronematous, mononematous, vesiculate, consisted of 1–9 subglobose, smooth, hyaline cells, unbranched, septate, constricted at the septa. Conidiogenous cells 7–16 9 7–14 μm (x̄ = 12 9 10 μm, n = 15), holoblastic, monoblastic, terminal, determinate, subglobose, ellipsoidal, sometimes swelling to globose, hyaline, smooth, thin-walled. Conidia 20–30 9 12–19 μm (= 25 9 16 μm, n = 40), solitary, acrogenous, ellipsoidal to obovoid, muriform, smooth, brown, 1 straight column of vertical septa and 3–5 rows of transverse septa, slightly constricted at the septa, darkened and thickly banded at the septa, canals in the septa obscured by dark pigmentation; basal cell single, cuneiform, sometimes swollen, pale brown to hyaline.

 

Culture characteristics: On PDA, colony circular, 10 mm in 40 days at 25 °C, brown to grey from above, black from below, raised, felty wooly, fairly dense.

 

Habitat: On submerged wood in a small river

 

Known distribution: China

 

Material examined: CHINA, Yunnan Province, on submerged wood in a small river, 25 November 2017, G.N. Wang, H158D (MFLU 18-1189, holotype), ex-type living culture, (MFLUCC 18-1396), ibid. H158D (HKAS 101725, isotype), ex-isotype living culture (KUMCC 18-0075).

 

GenBank Accession No: ITS: MK051033, LSU: MK051034, SSU: MK051035.

 

Notes: Canalisporium dehongense is morphologically similar to C. caribense (Hol.-Jech. & Mercado) Nawawi & Kuthub. and C. exiguum Goh & K.D. Hyde in having muriform conidia with one longitudinal septum, two cells at the apex and darkened bands at the septa (Goh et al. 1998b; Sri-indrasutdhi et al. 2010). However, it differs from C. caribense by its smaller conidia (20–30 9 12–19 μm vs. 24–51 9 15–29 μm) and from C. exiguum by having more rows of transverse septa (3–5 vs. 2–3). A comparison of nucleotides of C. dehongense with C. caribense SS03839, C. caribense SS03683 and C. exiguum SS00809 also reveals a difference of 94, 101 and 82 bp in the ITS gene region, respectively.