Pleosporales » Phaeosphaeriaceae

Mauginiella

Mauginiella Cavara, Atti R. Accad. Naz. Lincei, Mem. Cl. Sci. Fis., sér. 6 1–2: 65 (1925).

Index Fungorum number: IF 8869; Facesoffungi number: FoF 08335, 1 morphological species (Species Fungorum, 2022), 1 species with molecular data.

Occur as downy mycelial growth on young flowers, spathes or leaf-bases, later changing to powdery mass due to spore production. Asexual morph: Intercellular mycelium branched, thin-walled, short-celled. External or aerial mycelium branched, septate, thin-walled. Conidia produced by segmentation of aerial hyphae, unicellular or multicellular, usually with 1—6 (rarely up to 13) septa; wall sub hyaline, firm. In culture: Growth slow, covering 3 cm (on Malt Agar) and 3.6 cm (on PDA) at 24° C in 7 days from a centre inoculum. Mat white, cottony when immature turning powdery after sporulation; progressing zone narrow (1 mm) but distinct; reverse unchanged; odour not particular; oxidase test inconclusive (faint brown coloration). Hyphae (aerial and submerged), branched, septate, thin-walled. Conidia abundant and similar to those produced on the host. Sexual morph: Unknown (Adapted from Rattan & Al-Dboon, 1980).

 

Type species: Mauginiella scaettae Cavara

 

Notes: Mauginiella was introduced by Cavara et al. (1925) with M. scaettae as type species. Mauginiella is characterized by branched, thin-walled, short-celled intercellular mycelium, unicellular or multicellular conidia produced by segmentation of aerial hyphae. The mycelium growth in culture is slow growing, Mat white, cottony when immature turning powdery after sporulation forming abundant conidia similar to those found on the host substrate. Several authors studied the occurrence, varietal resistance and effect of fungicides on Mauginiella scaettae (Hansford, 1949; Al-Azzami, 1951; Adhami, 1953; Hussain, 1958; 1968; Dabbagh & Hussain, 1961; Al-Ani et al., 1965; Al-Hassan et al., 1971; Ismail, 1971; Hussain & Al-Beldawi, 1977; Al-Hassan & Waleed, 1977).  Cavara (1926) proposed Mauginiella based on the multiseptate conidia which are produced by the fragmentation of hyphae.  The validity of Mauginiella was later supported by Chabrolin (1928).  Maire and Werner (1937) synonymized Mauginiella under Geotrichum based on similar types of conidiogenesis and morphology of conidia. Anselme and Beltzakis (1957) wrongly identified another fungus, "Sporendonema sebi" Fries, for the pathogen of 'inflorescence rot'.  Cifferi (1958) synonymized Mauginiella under Sporendonema based on cultural characters. Elmer et al. (1968) and Nicot (1972) reviewed the biology and pathogenicity of Mauginiella scaettae. Von Arx (1970) recommended the early generic name Wallemia for Sporendonema and proposed the combination Wallemia sebi (Fries) V. Arx and mentioned it as the pathogen of 'inflorescence-rot'. Nicot (1972) mentioned that Mauginiella is a valid generic name distinct from Geotrichum based on conidium development and the accurate name of the pathogen of 'inflorescence-rot' is M. scaettae. Mauginiella produce thin-walled conidia that are short-lived and cannot survive high summer temperature (Al-Hassan & Waleed, 1977). Wijayawardene et al. (2017a, b; 2020) and Hongsanan et al. (2020) accommodated Mauginiella in Phaeosphaeriaceae based on morphology and phylogenetic analyses. Molecular markers available for Mauginiella are LSU and ITS.

 

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