Spiropes dorycarpus (Mont.) M.B. Ellis, Mycol. Pap. 114: 27, 1968

Bermudez-Cova, Miguel A., Hofmann, Tina A., Yorou, Nourou S. & Piepenbring, Meike, 2024, Systematic revision of species of Atractilina and Spiropes hyperparasitic on Meliolales (Ascomycota) in the tropics, MycoKeys 103, pp. 167-213 : 167

Spiropes dorycarpus (Mont.) M.B. Ellis, Mycol. Pap. 114: 27, 1968

Fig. 10

Helminthosporium dorycarpum ≡ Helminthosporium dorycarpum Mont., Annls Sci. nat., 2 Sér., 17: 120, 1842.

Pleurophragmium dorycarpum ≡ Pleurophragmium dorycarpum (Mont.) Hughes, Can. J. Bot. 36: 797, 1958.

Helminthosporium orbiculare = Helminthosporium orbiculare Lév., Annls Sci. nat., 3 Sér., 5: 299, 1846.

Napicladium myrtacearum = Napicladium myrtacearum Speg., An. Soc. cient. Argent. 26: 71, 1888.

Sporhelminthium myrtacearum ≡ Sporhelminthium myrtacearum (Speg.) Speg., Physis 4(17): 292, 1918.

Helminthosporium conspicuum = Helminthosporium conspicuum McAlpine, Proc. Linn. Soc. N.S.W. 22: 40, 1897.

Podosporium densum = Podosporium densum Pat., J. Bot. Paris 11: 373, 1897.

Helminthosporium asterinoides = Helminthosporium asterinoides Sacc. & P. Syd., apud Saccardo, Rc. Congr. Bot. Palermo, May 1902: 58, 1902.

Sporhelminthium asterinoides ≡ Sporhelminthium asterinoides (Sacc. & Syd.) Speg., Physis 4(17): 292, 1918.

Helminthosporium melastomacearum = Helminthosporium melastomacearum F. Stevens, Bot. Gaz. 65: 242, 1918.

Helminthosporium panici = Helminthosporium panici F. Stevens, Bot. Gaz. 65: 242, 1918.

Helminthosporium parathesicola = Helminthosporium parathesicola [as ' parathesicolum '] F. Stevens, Bot. Gaz. 65: 242, 1918.

Description.

Colonies effuse, brown to dark brown, hairy. Hyphae superficial, branched, septate, 1-3 µm wide, straw-coloured, pale brown, smooth. Conidiophores arising singly or in groups, terminally or laterally from the hyphae, erect or ascending, straight or flexous, septate, up to 700 µm long, 3-7 µm thick, straw-coloured, pale brown to brown, with scattered cylindrical scars towards the apex. Conidia solitary, straight or slightly curved, variable in shape, but mostly obclavate to fusiform, truncate at the base, mostly 3-septate, but sometimes with 4 to 5 septa, (16-)20-35(-40) × (4.5-)5-7 µm, straw-coloured to pale brown, middle cells slightly darker, wrinkled or verrucose. As seen by SEM, the ornamentation of the spores is distinctly reticulated, with thin to thick networks and no ridges.

Specimen examined.

On Meliola sp. on living leaves of Coffea arabica , Benin, Atlantique, Attogon, Niaouli Forest, 6°44'23"N, 2°8'26"E, 119 m a.s.l., 19 September 2022, A. Krauß, A. Tabé, O. Koukol, N.S. Yorou, AK06H.

Additional specimens examined.

On Eugenia pungens , Brasil, Guarapí, 1883, B. Balansa, 3939, (IMI 100322, type of Napicladium myrtacearum ); on Meliola sp. on leaves of an unknown plant, Cuba, R. de la Sagra (IMI 10002, type of Helminthosporium dorycarpum ) .

Illustrations.

This species was illustrated by Ellis (1968).

Known hosts and distribution.

On colonies of Appendiculella spp., Asteridiella spp., Clypeolella spp., Irenopsis spp., Meliola spp. and Schiffnerula spp., on living leaves of various plants in Australia, Brazil, Chile, Congo, Cuba, Dominican Republic, Ghana, Guyana, India, Malaysia, Nigeria, Puerto Rico, Sierra Leone, South Africa, Taiwan, Tanzania and Uganda ( Ellis 1968). Spiropes dorycarpus is reported here for the first time for Benin.

Notes.

Spiropes dorycarpus is similar to S. effusus and S. helleri by the presence of non-synnematous conidiophores and conidia mostly with three true septa. However, conidia of S. effusus are narrower (3-5 µm) than those of S. helleri (7-13 µm).

Figures

Figure 10. Spiropes dorycarpus (AK 06 H) a superficial hyphae growing on a colony of Meliola sp. on a leaf of Coffea arabica b, c in optical section b conidiophore growing on a hypha of Meliola sp. c conidia. The thickness of the wall is indicated only in the drawing on the left-hand side d, e As seen by SEM d conidiophore with a scar e conidium. Scale bars: 1 mm (a); 5 μm (b); 3.5 μm (c); 3 μm (d); 7 μm (e).