Syd. & P. Syd., Ann. Mycol. 15: 258. 1917. Fig. 53.
Synonyms: Hendersoniopsis Woron., Fungal and Bacterial Diseases of Agricultural Plants: 255. 1922.
Phaeostagonosporopsis Woron., La Defense des Plantes, Leningrad 2: 333. 1925.
Classification: Sordariomycetes, Diaporthomycetidae, Diaporthales, Diaporthaceae.
DNA barcodes (genus): LSU, ITS.
DNA barcodes (species): ITS, tef1. Table 19.
|Species||Isolates1||GenBank accession number2||References|
|Stenocarpella macrospora||CBS 117560ET||FR748048||MG934504||Lamprecht et al. (2011), present study|
|S. maydis||CBS 117558ET||FR748051||FR748080||Lamprecht et al. (2011)|
CBS: Westerdijk Fungal Biodiversity Institute, Utrecht, The Netherlands. ET indicates ex-epitype strains.
ITS: internal transcribed spacers and intervening 5.8S nrDNA; tef1: partial translation elongation factor 1-alpha gene.
Mycelium immersed, brown, branched, septate. Conidiomata pycnidial, solitary or sometimes confluent, globose or elongated, dark brown, subepidermal, unilocular; conidiomatal wall composed of dark brown, thick-walled cells of textura angularis; neck single, circular, papillate, protruding. Conidiophores usually reduced to conidiogenous cells. Conidiogenous cells enteroblastic, phialidic, determinate, discrete, rarely integrated on 1-septate conidiophores, cylindrical, collarette with minute channel, periclinal wall thickened, formed from inner cells of pycnidial wall. Conidia pale brown, 0−3-septate, continuous or constricted, cylindrical to fusiform, straight or curved, apex obtuse, base tapered and truncate, thick and smooth-walled, eguttulate. Beta conidia absent or present, hyaline, scolecosporous, curved. Sexual morph unknown (adapted from Sutton 1980).
Culture characteristics: Colonies flat, with abundant aerial mycelium giving a cottony appearance; under continuous near-ultraviolet light abundant sporulation in 1 wk. On OA surface white to rosy buff to vinaceous buff, centre isabelline; reverse vinaceous buff, centre isabelline.
Optimal media and cultivation conditions: OA and PNA at 25 °C under continuous near-ultraviolet light to promote sporulation.
Distribution: Africa, America, Asia and Europe.
Host: Zea mays (Poaceae).
Notes: The genus Stenocarpella was introduced by Sydow & Sydow (1917), with S. zeae designated as type species. Sutton (1977) synonymised S. zeae with Diplodia macrospora, transferring this latter species to Stenocarpella, recognising S. macrospora as the correct name for the type species. Two species are included in this genus i.e. S. macrospora and S. maydis, which cause Diplodia ear rot of maize (Crous et al. 2006b).
Stenocarpella was initially placed in the Botryosphaeriaceae (Botryosphaeriales) because of the similarity with Diplodia. In a phylogenetic study based on LSU sequences, Crous et al. (2006b) showed that Stenocarpella belongs to the Diaporthaceae (Diaporthales). Subsequently, Lamprecht et al. (2011) confirmed this placement based on ITS and tef1 sequences.
Authors: Y. Marin-Felix & P.W. Crous