Achorella ametableta
Achorella ametableta (Rehm) Theiss. & Syd, Annls mycol. 13(3/4): 340 (1915)
≡ Dothidella ametableta Rehm, Hedwigia 36: 376 (1897)
Index Fungorum number: IF 145625; Facesoffungi number: FoF 06208 Fig. 1
Parasitic or epiphytic on the surface of living leaves of Baccharis. Sexual morph: Undetermined. Asexual morph: Conidiomata 100–150 high × 140−170 µm diam., (x̅ = 125 × 150 µm, n = 10), pycnidial, eustromatic, superficial, multilocular, black, subglobose, aggregated, thick–walled; walls composed of dark brown textura angularis. Conidiophores hyaline, cylindrical, reduced to conidiogenous cells. Conidiogenous cells 5−7 µm × 2−4 µm (x̅ = 6 × 3 µm, n = 10), phialidic, cylindrical, 1-septate. Conidia 8–15 µm × 2–5 µm (x̅ = 11 × 4 µm, n = 20), hyaline, 2-celled, septate, cylindrical, apical obtuse, smooth-walled with tiny setula or appendage.
Material examined – BRAZIL, Brasilia, Padres Grandes, on Baccharis sp (Asteraceae), August 1880, E. Ule (S-F 47804, holotype).
Economic significance – The genus Achorella is markedly parasitic, causing well defined diseased spots on the host (Steven 1923). The genus has been reported to cause disease in Cohune palm seeds (Janick & Paull 2008).
Figure 1 – Achorella ametableta (S-F47804, holotype). a–b Herbarium material. c–d Stroma. e Peridium. f Cross section of conidioma. g Conidia with conidiogenous cell. h–i Conidia, arrow showing tiny setula. Scale bars: c = 1000 µm, d = 500 µm, e, f = 50 µm, g–l = 10 µm.
References
Janick J, Paull RE. 2008 – The Encyclopedia of Fruits & Nuts. Wallingford, UK, Cambridge, MA: CABI North American Office.
Stevens FL. 1923 – Parasitic fungi from British Guiana and Trinidad. Illinois Biology Monographs 8, 1–76.
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