17 Sep Limonomyces
Limonomyces Stalpers & Loer., Can. J. Bot. 60(5):553 (1982)
Limonomyces was introduced by Stalpers and Loerakker (1982) and is typified with L. roseipellis, causing pink disease in turf grasses. As in many Corticiaceae, the species forms thin, effused pink-coloured fruiting bodies with a simple microstructure. The second species L. culmigenus also causes pink disease on grasses, but with less obvious disease symptoms.
Classification – Agaricomycetes, incertae sedis, Corticiales, Corticiaceae
Type species – Limonomyces roseipellis Stalpers & Loer., Can. J. Bot. 60(5):553 (1982)
Distribution –Britain, Canada, China, Italy, the Netherlands, US
Disease Symptoms – Pink Patch Disease
In the early stage of infection, symptoms appear as small blighted areas on leaves that enlarge rapidly to cover most of the leaf blade. Affected leaves dry out and fade to a bleached straw colour, appearing as irregular-shaped patches on blighted grasses. During moist weather, leaves are covered with pink mycelium (Maccaroni et al. 2002; Burpee et al. 2003; Zhang et al. 2013).
Hosts – Poaceae
Morphological based identification and diversity
Limonomyces comprises two species (Index Fungorum 2018), morphologically differing in their spore size and number of strigmata. The species are distributed in the northern hemisphere. While L. culmigenus is rare, the generic type has a wider distribution. Limonomyces can be morphologically distinguished by spores, a number of strigmata and distribution.
Molecular based identification and diversity
The affinity of Limonomyces to some genera in Corticiales such as Vuilleminia and Galzinia was discussed in its original description. Limonomyces species are nested in a clade containing Laetisaria and several asexual Marchandiomyces, but the two species in the genus do not form a monophyletic clade.
Recommended genetic marker (genus level) – nLSU (confident placement in Corticiaceae)
Recommended genetic marker (species level) – ITS
Accepted number of species: Two species
References: Maccaroni et al. 2002 (morphology); Burprr et al. 2003 (pathogenicity); Zhang et al. 2013 (morphology, phylogeny and pathogenicity)