Rhopaloconidium
Rhopaloconidium Petr., Sydowia 6(1-4): 300 (1952).
Index Fungorum number: IF 9744; Facesoffungi number: FoF 08652, 1 morphological species (Species Fungorum 2022), no molecular data available.
Associated with leaf spot. Sexual morph: Unknown. Asexual morph: Perithecia very rudimentary, minute, crowded in the brown spots in areas limited by the veinlets, opening below and discharging the oblong-fusoid granular, nucleate and finally about 3-septate, slightly constricted conidia in form of a white pruinosity on the surface of the leaf (adapted from description of P. asiminae in Martin, 1887).
Associated with leaf spot. Sexual morph: Unknown. Asexual morph: Intramatrical mycelium stained, composed of loosely branched hyphae, hyaline, indistinctly septate; tufts very minutely punctiform, dense, often confluent, whitish. Conidiophores in superficial hypostroma very pale brownish color, often undifferentiated, simple, continuous or 1-3 septate, often straight. Conidia acrogenous, less clavate-oblong or fusoid-clavate, more cylindrical-fusoid or elongate-fusoid, sometimes almost caudate, pluriseptate, hyaline (adapted from Petrak, 1952).
Type species: Rhopaloconidium asiminae (Ellis & Morgan) Petr.
Notes: Rhopaloconidium is characterised by superficial hypostroma, simple, continuous or 1–3-septate conidiophores, and acrogenous, clavate-oblong or fusoid-clavate, more cylindrical-fusoid or elongate-fusoid, hyaline conidia. Braun and Crous (2008) suggested the combination of Phloeospora asiminae into Pseudocercospora but this was not confirmed based on molecular data. The placement of Rhopaloconidium in Mycosphaerellaceae is doubtful. Fresh collections with DNA sequence data are needed to confirm the taxonomic placement of Rhopaloconidium.
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