Mycologia (2009) 101, 717-732

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Jo Anne Crouch, Bruce B. Clarke, James F. White Jr. and Bradley I. Hillman (2009)
Systematic analysis of the falcate-spored graminicolous Colletotrichum and a description of six new species from warm-season grasses
Mycologia 101 (5), 717-732
Abstract: Species limits in the fungal genus Colletotrichum are traditionally distinguished by appressorial and/or conidial morphology or through host plant association, but both criteria are criticized for their inability to resolve distinct taxa. In previous research eight novel falcate-spored Colletotrichum species were identified from graminicolous hosts using multilocus molecular phylogenetic analysis. In the present work formal descriptions and illustrations are provided for six of the new taxa: C. hanaui sp. nov., C. nicholsonii sp. nov., C. paspali sp. nov., C. jacksonii sp. nov., C. miscanthi sp. nov. and C. axonopodi sp. nov.; and an emended description with epitypification is provided for C. eleusines. Comparison of hyphopodial appressoria and host association against phylogenetic species boundaries and evolutionary relationships in the graminicolous Colletotrichum group demonstrate that, while these characters can be useful in combination for the purpose of species diagnosis, erroneous identification is possible and species boundaries might be underestimated if these characters are used independently, as exemplified by the polyphyletic taxa C. falcatum. Appressoria have been subject to convergent evolution and were not predictive of phylogenetic relationships. Despite these limitations, the results of this work establish that in combination appressorial and host range characters could be used to generate informative dichotomous identification keys for Colletotrichum species groups when an underlying framework of evolutionary relationships, taxonomic criteria and nomenclature have been satisfactorily derived from molecular systematic treatments.
(The abstract is excluded from the Creative Commons licence and has been copied with permission by the publisher.)
Link to article at publishers website
Database assignments for author(s): Bradley I. Hillman

Research topic(s) for pests/diseases/weeds:
molecular biology - genes

Pest and/or beneficial records:

Beneficial Pest/Disease/Weed Crop/Product Country Quarant.

Colletotrichum truncatum Soybean (Glycine max)
Colletotrichum truncatum Lentil (Lens culinaris)
Colletotrichum graminicola Maize/corn (Zea mays)
Colletotrichum trifolii Alfalfa/lucerne (Medicago sativa) New Zealand
Colletotrichum falcatum Sugarcane (Saccharum officinarum)
Colletotrichum dematium Netherlands
Colletotrichum dematium New Zealand
Colletotrichum dematium Mexico
Colletotrichum dematium Potato (Solanum tuberosum)
Colletotrichum dematium Beech (Fagus) Japan
Colletotrichum dematium Passionfruit (Passiflora) Japan
Colletotrichum dematium Mulberry (Morus) Japan
Colletotrichum dematium Primrose (Oenothera)
Colletotrichum capsici New Zealand
Colletotrichum capsici Green pepper/chilli (Capsicum) Indonesia
Colletotrichum capsici Thorn apple (Datura stramonium)
Colletotrichum sublineola Sorghum (crop)
Colletotrichum lini Linseed/flax (Linum usitatissimum) United Kingdom
Colletotrichum caudatum Grasses/turf/rangeland
Colletotrichum cereale Grasses/turf/rangeland
Colletotrichum cereale Oat (Avena sativa)
Colletotrichum cereale Wheat (Triticum)
Colletotrichum circinans Onion/garlic/leek (Allium) Netherlands
Colletotrichum eleusines Japan
Colletotrichum eleusines Eleusine (crop) U.S.A. (SE)
Colletotrichum trichellum Bamboo
Colletotrichum axonopodi Grasses/turf/rangeland Honduras
Colletotrichum axonopodi Grasses/turf/rangeland U.S.A. (mid S)
Colletotrichum axonopodi Grasses/turf/rangeland U.S.A. (SE)
Colletotrichum axonopodi Grasses/turf/rangeland Australia (NT+QLD)
Colletotrichum hanaui Digitaria (crop) Japan
Colletotrichum hanaui Digitaria (crop) U.S.A. (mid N)
Colletotrichum hanaui Digitaria (crop) U.S.A. (SE)
Colletotrichum jacksonii U.S.A. (NE)
Colletotrichum jacksonii Barnyard millet (Echinochloa) Japan
Colletotrichum miscanthi Miscanthus (crop) Japan
Colletotrichum nicholsonii Paspalum (crop) Japan
Colletotrichum nicholsonii Paspalum (crop) New Zealand
Colletotrichum paspali Paspalum (crop) Japan