Glomerellales » Plectosphaerellaceae » Acrostalagmus

Acrostalagmus annulatus

Acrostalagmus annulatus (Berk. & M.A. Curtis) Seifert, in Réblová, Gams & Seifert, Stud. Mycol. 68: 186 (2011)

Index Fungorum number: IF518663         Facesoffungi number: FoF05253

 

Basionym: Stilbum annulatum Berk. & M.A. Curtis, in Berkeley, Grevillea 3(no. 26): 63 (1874)

 

Sexual morph: Undetermined. Asexual morph: Hyphomycetous. forming rounded pale reddish brown slimy heads, oval. Conidiophore axis erect, repeatedly branched, pale reddish brown at the base and hyaline at the apex, full-grown conidiophore stipes 4–5 μm wide at the base, tapering to 3 μm. Conidiogenous cells phialidic 9–26 × 2–3.5 μm, narrowly flask-shaped in the widest part, arising in whorls of 1–5 at several levels along the main stipe and its branches. Conidia 6–8 × 3–4 μm (x̄ = 7.4 × 3.6 μm, n = 30), hyaline, subglobose to cylindrical, single-celled.

 

Culture characteristics: Conidia germinated on MEA. On MEA colonies are appressed, circular, flat surface, edge entire, first cream then become dark brown and rise in the centre with mycelium, reverse brown reaching 2 cm in 2 weeks at 18 °C.

 

Host and Habitat: Saprobic on Ananas comosus, Brassica sp., Glycine max, G. soja, Luffa acutangula, decayed fruits of unidentified plants, dead stem as well as soil and roots (Giraldo and Crous 2019; Farr and Rossman 2021).

 

Known distribution: Brazil, Cuba, Japan, Mexico, Sierra Leone, Thailand and Venezuela (Giraldo and Crous 2019; Hyde et al. 2019; Farr and Rossman 2021).

 

Material examined: THAILAND, Chiang Mai Province, Doi Suthep, 22 December 2015, decaying fruits of unknown species, S.C. Jayasiri, C 132 (MFLU 16-0952), living culture MFLUCC 16-0612.

 

GenBank Accession No: ITS: MK607614, LSU: MK607617, RPB2: MK607616, SSU: MK607615.

 

Figure X. Acrostalagmus annulatus (MFLU 16-0952, new geographical record). a Host fruit. b, c Conidiomata on host surface. d Conidiophores. e–g Conidiogenus cells and conidiophores with conidia. h, i Conidia. Scale bars: d = 20 μm, e–i = 10 μm.

 

 

Notes: The new isolate of Acrostalagmus annulatus fits with the type description in having erect, roughened, verticillate conidiophores, phialidic conidiogenous cells and oblong-ellipsoidal conidia accumulate in slime (Seifert 1985; Réblová et al. 2011). Acrostalagmus annulatus (MFLUCC 16-0612) forms a sister clade to A. annulatus (DAOM 212126) and an environment sample with high statistical support (100% ML/1.00 BYPP; Hyde et al. 2019). Based on morphology and phylogenetic affinity introduced a new record of A. annulatus from Thailand.

 

Reference:

1. Farr DF, Rossman AY (2021) Fungal Databases, U.S. National Fungus Collections, ARS, USDA. https://nt.ars-grin.gov/fungaldatabases/

2. Giraldo A, Crous PW (2019) Inside Plectosphaerellaceae. Stud Mycol 92: 227–286.

3. Hyde KD, Tennakoon DS, Jeewon R, Bhat DJ et al. (2019) Fungal diversity notes 1036–1150: taxonomic and phylogenetic contributions on genera and species of fungal taxa. Fungal Divers. 96: 1–242.

4. Réblová M, Gams W, Seifert KA (2011) Monilochaetes and allied genera of the Glomerellales, and a reconsideration of families in the Microascales. Stud Mycol 68: 163−191.

5. Seifert KA (1985) A monograph of Stilbella and some allied hyphomycetes. Stud Mycol 27: 1–235.

 

 

 

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