Colletotrichum: complex species or species ... - CBS - KNAW

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Damm et al. Fig. 12. Colletotrichum karstii (from strain CBS 127597). A–B. Conidiomata. C. Tip of seta. D. Basis of seta. E–I. Conidiophores. J–N. Appressoria. O–P. Conidia. Q–R. Ascomata. S. Outer surface of peridium. T. Peridium in cross section. U. Ascospores. V–X. Asci. Y. Paraphyses. A, C–F, O. from Anthriscus stem. B, G–N, P–Y. from SNA. A–B, Q. DM, C–P, R–Y. DIC, Scale bars: A = 200 µm, B, Q = 100 µm, R = 50 µm, E, S = 10 µm. Scale bar of E applies to C–P. Scale bar of S applies to S–Y. 24
The Colletotrichum boninense species complex Fig. 13. Colletotrichum novae-zelandiae (from ex-holotype strain CBS 128505). A–B. Conidiomata. C–E. Conidiophores. F. Tip of seta. G. Basis of seta. H–J. Conidiophores. K–Q. Appressoria. R–S. Conidia. A, C–G, R. from Anthriscus stem. B, H–Q, S. from SNA. A–B. DM, C–S. DIC, Scale bars: A = 200 µm, C = 10 µm, L = 25 µm. Scale bar of A applies to A–B. Scale bar of C applies to C–J and R–S. Scale bar of L applies to K–Q. fruits (Tozze et al. 2010) were identified as C. karstii by GAPDH sequences (GenBank accessions FJ949450 and FJ949452, not included in phylogeny). ITS sequences of endophytic strains of C. gloeosporioides “group 2” from Musa acuminata from Thailand (Photita et al. 2005) as well as C. boninense isolates from Persea americana from Mexico (Silva-Rojas & Ávila-Quezada 2011), Maytenus ilicifolia from Brazil (Pileggi et al. 2009) and Passiflora sp. in Florida, U.S.A. (Tarnowski & Ploetz 2010) are identical or similar to those of C. karstii (and C. phyllanthi). Sequence and morphological variability is high, with differences in conidium size and conidiomatal structures ranging from sporodochial to acervular to closed. This makes identification difficult if based on morphology alone. The conidia of C. karstii are smaller than those of C. hippeastri and C. dracaenae, and broader than those of C. phyllanthi. The asci are shorter than those of C. brassicicola and C. dracaenae, and the shape of the ascospores differs from C. boninense, being slightly wider and less tapered in that species. Some strains have morphological features that are slightly different from those of strain CBS 127597 described above. Strain CBS 129833 forms rather larger asci (190–220 × 140–170 µm) and brown, roundish closed conidiomata that open by irregular rupture, and covered with brown, verrucose to warted hairs/ hyphae, 3–3.5 µm wide. In addition, the setae are more frequent, shorter (40–80 µm long) and broader at the base (5–7.5 µm diam). The appressoria are larger, measuring (5.5–)7.5–13(–17) × (4.5–) 5.5–8.5(–10.5) µm, mean ± SD = 10.3 ± 2.6 × 7.1 ± 1.5 µm, L/W ratio = 1.4. This strain and CBS 111998 are also slower-growing than the type; on SNA: 20–22.5 mm in 7 d (32–34.5 mm in 10 d) and 20.5–22.5 mm in 7 d (30.5–31.5 mm in 10 d), and on OA: 21.5–23.5 mm in 7 d (33.5–35 mm in 10 d) and 15.5–16.5 mm in 7 d (25–27 mm in 10 d). There are some indications that CBS 129833 is distinct phylogenetically from the main body of C. karstii strains, but the sequence differences are slight. Colletotrichum novae-zelandiae Damm, P.F. Cannon, Crous, P.R. Johnst. & B. Weir, sp. nov. MycoBank MB560742. Fig. 13. Etymology: Named after the country from which it was collected, New Zealand. Teleomorph not observed. Anamorph on SNA. Vegetative hyphae 1.5–10 µm diam, hyaline, smooth-walled, septate, branched. Chlamydospores not observed. Conidiomata absent, conidiophores formed directly from vegetative hyphae or from angular to roundish, hyaline, thick-walled cells, 3–8 µm diam. Setae not observed. Conidiophores hyaline, smooth-walled, septate, branched, to 50 µm long. Conidiogenous cells hyaline, smooth-walled, cylindrical to more or less inflated, often extending to form new conidiogenous loci, making the conidiogenous cell appear catenate, sometimes polyphialidic, 4.5–20 × 4–6 µm, opening 1.5–2 µm diam, collarette www.studiesinmycology.org 25
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Colletotrichum: complex species or species ... - CBS - KNAW

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