Saprodesmium W. Dong and Doilom gen. nov.
Index Fungorum number: IF558196; Facesoffungi number: FoF 09873
Etymology: “saprus” = saprobic, referring to the saprobic lifestyle of the fungus; “desmós” = bond, link, referring to the aggregated conidia in sporodochia
Saprobic on decaying wood submerged in freshwater.
Sexual morph: undetermined.
Asexual morph: hyphomycetous. Colonies on natural substrate, effuse, gregarious, punc- tiform, sporodochial, raised, black. Mycelium partly immersed in natural substrate, con- sisting of branched, septate, thin-walled, smooth, pale brown to brown hyphae. Conidio- phores micronematous, mononematous, unbranched, vesiculate, septate. Conidiogenous cells holoblastic, monoblastic, integrated, determinate. Conidia solitary, obovoid to ellipsoidal, clearly muriform, olivaceous when young, becoming quite blackish with age and obscur- ing the septa, with several subhyaline basal cells, smooth, thin-walled. Conidial secession schizolytic.
Type species: Saprodesmium dematiosporum W. Dong, Doilom and K.D. Hyde
Notes: – The BlastN search of NCBI’s GenBank using the LSU sequence shows Saprodesmium dematiosporum has the closest hits with several genera in Pleurotheciaceae, i.e., Rhexoacrodictys erecta (KUMCC 20-0194, similarity = 96.68%), Neomonodictys muri- formis (MFLUCC 16-1136, similarity = 94.11%) and Pleurothecium obovoideum (CBS 209.95, similarity = 93.73%). The closest hits using SSU sequence are Rhexoacrodictys erecta (KUMCC 20-0194, similarity = 99.54%), Dematipyriforma aquilaria (3-11-1, similarity = 99.49%) and Pleurothecium aquaticum (B-27, similarity = 99.06%). Based on ITS BlastN search, the closest relatives are however Phaeoisaria sp. (BAB-4787, similarity = 97.11%) and Pleurothecium re- curvatum (CBS 138686, similarity = 96.11%). Saprodesmium dematiosporum clusters as an inde- pendent branch between Dematipyriforma and Rhexoacrodictys with high bootstrap support in concatenated LSU-SSU-ITS-rpb2 phylogeny (100% ML BS/1.00 BI PP, Figure 1) and indi- vidual ITS phylogeny (100% ML BS/1.00 BI PP, Supplementary Figure S2). Saprodesmium dematiosporum clusters with Rhexoacrodictys species in individual LSU phylogeny, but no bootstrap support (Supplementary Figure S1).
![Picture1](https://www.facesoffungi.org/wp-content/uploads/2022/03/Picture1-21.jpg)
Figure 1. Cont.
![Picture1](https://www.facesoffungi.org/wp-content/uploads/2022/03/Picture1-22.jpg)
Figure 1. RAxML tree of Savoryellomycetidae with four orders, Conioscyphales, Fuscosporellales, Pleurotheciales and Savoryellales. The multi-locus tree is generated from combined LSU, SSU, ITS and rpb2 sequence data. Bootstrap support values for maximum likelihood (the first value) equal to or greater than 60% and Bayesian posterior probabilities (the second value) equal to or greater than 0.95 are placed near the branches as ML BS/BI PP. The asterisk “*” represents bootstrap support values with 100% ML BS and 1.00 BI PP. The tree is rooted to Doratomyces stemonitis AFTOL-ID 1380 and Microascus trigonosporus AFTOL-ID 914. The ex-type cultures are indicated using “T” after strain numbers and the new species introduced in this study are indicated in bold.
Species