Fungalpedia – Note 1024, Minimelanolocus
Minimelanolocus. R.F. Castañeda & Heredia.
Citation when using this data: Tian Q et al. 2021 (in prep.) – Fungalpedia, Ascomycota.
Index Fungorum, Facesoffungi, MycoBank, GenBank., Fig 1
Classification: Incertae sedis, Incertae sedis, Incertae sedis, Incertae sedis, Pezizomycotina, Ascomycota, Fungi
Saprobic on decaying wood in aquatic habitats. Mycelium superficial or partly immersed, comprising septate, pale brown to brown hyphae, smooth-walled hyphae. Colonies superficial on the host, effuse, scattered, hairy, brightly colored, glistening. Sexual morph: Undetermined. Asexual morph: hyphomycetous. Conidiophores mononematous, macronematous, unbranched, erect, dark brown and gradually paler towards the apex, straight or flexuous, cylindrical, smooth, septate. Conidiogenous cells holoblastic, integrated, sympodial proliferating, terminal, pale brown to brown or subhyaline to hyaline. Conidia acrogenous, oblong or clavate to fusiform, with or without obtuse ends, hyaline to pale brown or brown, solitary, sometimes with secondary conidia, immature conidia aseptate, multi-septate at maturity, dry, smooth-walled. Conidial secession schizolytic.
Type material – Cuba, Havana, Instituto de Investigaciones Fundamentales en Agricultura Tropical “Alejandro de Humboldt”, on fallen leaves of Gesneria sp. (Gesneriaceae), 1987 (Holotype).
Notes – Minimelanolocus was introduced by Castañeda-Ruiz et al. (2001) and typified by M. navicularis based on segregation of some atypical species from Pseudospiropes. The genus is characterized by conspicuous, mononematous, solitary or fasciculate, septate, erect, straight or flexuous, smooth or verrucose, cylindrical, sinuate or geniculate, brown to dark brown conidiophores, with a melanized base and hyaline to brown, oblong, cylindrical, clavate to fusiform, euseptate, acropleurogenous conidia (Castañeda-Ruiz et al. 2001, Hernández-Restrepo et al. 2013, Xia et al. 2014). Pseudospiropes species have comparatively smaller, ellipsoidal and distoseptate conidia (Castañeda-Ruiz et al. 2001, Ma et al. 2011a). Minimelanolocus is a well-studied genus, which has been described from a wide range of hosts (Zhang et al. 2009, 2010, Ma et al. 2011a, b, Hernández-Restrepo et al. 2013, Xia et al. 2014). Presently, 34 species epithets are listed under Minimelanolocus (Index Fungorum 2021). The members of Minimelanolocus have a worldwide distribution, and most are saprobes on rotten leaves or dead twigs, wood and bark in aquatic habitats. In this study, Minimelanolocus rousselianus (Mont.) R.F. Castañeda & Heredia (CBS 126086) aligned with Thysanorea papuana (Aptroot) Arzanlou et al. (CBS 212.96) with 98% ML BS, 1.00 BY PP support in Herpotrichiellaceae based on combined LSU and ITS analysis.
Type species: Minimelanolocus navicularis (R.F. Castañeda) R.F. Castañeda, in Castañeda Ruiz, Heredia, Reyes, Arias & Decock, Cryptog. Mycol. 22(1): 9 (2001)
≡ Pseudospiropes navicularis R.F. Castañeda, Fungi Cubenses II (La Habana): 10 (1987)
Other accepted species: Species Fungorum – search Minimelanolocus.
Figure 1 – Minimelanolocus navicularis (a–c redrawn from Crous et al. 2006; d redrawn from Castañeda-Ruiz et al. 2001). a Conidiophore. b Conidiogenous cells. c Base of conidiophore.
d Conidia. Scale bar: a–d = 10 μm.
References
Entry by
Qing Tian, Center of Excellence in Fungal Research, Mae Fah Luang University, Chiang Rai 57100, Thailand, School of Science, Mae Fah Luang University, Chiang Rai 57100, Thailand
Published online 16 December 2021