Bahusakala olivaceonigra
Bahusakala olivaceonigra (Berk. & Broome) Subram. [as 'olivaceo-nigra'], J. Indian bot. Soc. 37: 63 (1958) Fig. 1, 2
≡ Septonema olivaceonigrum Berk. & Broome, J. Linn. Soc., Bot. 14(no. 74): 90 (1873) [1875]
Index Fungorum number: IF 293585; Facesoffungi number: FoF 06217
Pathogenic on leaves of Agave sisalana in terrestrial habitat. Sexual morph: Undetermined. Asexual morph: Hyphomycetous. Mycelium hairy, dense, partly immersed, partly superficial, congested, effuse, composed of branched, septate, thick-walled, olive-black 2–3.5 µm hyphae. Stroma none. Setae and hyphopodia absent. Conidiophores 28–60 µm × 2.5–3.5 µm (x̅ = 38 × 3 µm, n = 20), distinct, solitary, macronematous, mononematous, arthric, erect, branched, cylindrical, smooth to verruculose, septate, thick-walled, producing arthroconidium. Conidiogenous cells 7–8.5 µm × 2–4 µm (x̅ = 8 × 3 µm, n = 20), holothallic, terminal, integrated, brown, smooth, 8 µm long, 3 µm wide at the tip. Conidia 6.4–12.3 µm × 2.8–4.4 µm (x̅ = 8.1 × 3.4 µm, n = 10), simple, more or less cylindrical or oblong, brown or dark brown, smooth, wrinkled or verrucose with one or more transverse septa.
Material examined – SRI LANKA, on leaves of Agave sisalana (Asparagaceae), 1873, G.H.K Thwaites (K (M) 109483, holotype).
Economic significance – The genus Bahusakala is the causal organism of leaf blight disease of the sisal (Agave sisalana). The fungus can infect the leaf tissue through wounding (Phuphaibun et al. 1980). It has also been identified as seed-borne mycota from seed samples collected from various localities of Pakistan and other countries (Rahim et al. 2013).
Figure 1 – Bahusakala olivaceonigra (K (M) 109483, holotype). a, b Herbarium specimen and habit on leaf. c Squash mount of conidioma. d–g Conidiophores. h–k Conidia. Scale bars: b = 1 mm, c = 30 μm, d–g = 10 μm, h–k = 5 μm.
Figure 2 – Bahusaka1a olivaceonigra (redrawn from Guarro et al. 1980). a. Conidia b. Conidiophores. Scalebar: x = 10 µm.
References
Phuphaibun A, Phiriyanphrun S, Sarinthu N. 1980 – Study on the causal agent of leaf blight disease of the sisal, Agave sisalana. Available at: https://agris.fao.org/agris-search/search.do?recordID=XB8120932
Rahim S, Dawar S, Zaki MJ. 2013 – Mycoflora associated with the seed samples of Cucurbita Pepo l. collected from Pakistan. Pakistan Journal of Botany 45, 2173–2179
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