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Rong, I. H. & W. Gams. The hyphomycete genera Exochalara and Monilochaetes. Mycotaxon 76: 451-462. 2000.

ABSTRACT: The fungus Moniliochaetes infuscans causes scurf disease or soil stain of sweet-potato, Ipomoea batatas. The disease was known from America since 1890, later also from Australia, Asia, Europe, New Zealand, and the Pacific Islands; in South Africa it was reported in 1995. Comparative morphological and cultural investigations of M. infuscans, the type species of the genus, and species of the related genera Exochalara and Dischloridium indicated that D. cylindrospermum is conspecific and E. guadalcanalensis congeneric with M. infuscans. The new combination M. guadalcanalensis is proposed. This arrangement results in Moniliochaetes accommodating two species, while the type species of Exochalara, E. longissima (Grove) W. Gams & Hol.-Jech., and a subsequently described species, E. imbricata Hol.-Jech., are retained in Exochalara, a genus characterized by sympodially branching, rather pale brown, concolorous conidiophores and rather narrow, fusiform conidia. The type species of Dischloridium, D. laeënse, is quite distinct in having strongly fasciculate and much larger conidiogenous dimensions, but other species described in that genus may also be assigned to Monilochaetes, but the generic limits are not yet sufficiently defined.

KEYWORDS: hyphomycetes, Dischloridium, Ipomoea, scurf, sweet-potato

NOMENCLATURAL NOVELTIES:
Moniliochaetes guadalcanalensis (Matsush.) I. H. Rong & W. Gams, p. 455

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