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 Add this item to the list   828871 Original description
   
Remarks (public):Notes: Arthrinium piptatheri is genetically close to A. marii, A. sacchari, A. guizhouense, A. hispanicum and A. mediterranei, A. longistromum, and to a lesser extent A. pseudospegazzinii (Figs. 1-2) and the clade around A. phaeospermum. The incomplete genetic data is probably the cause behind the lack of significant support for some of these taxa. Morphologically, A. piptatheri differs from A. marii because of its sympodial, branched conidiogenous cells. Arthrinium guizhouense has shorter conidiogenous cells (3.5–8.0 μm). No sexual morph from A. piptatheri could be studied, and therefore a comparison with the long linear stromata of A. longistromum is not possible by now. Finally, some sequences of Ap. montagnei are related also with this group (Fig. 2), but this species is considered the sexual morph of A. arundinis, with a very different genetic profile in Crous & Groenewald (2013), so its actual identity should be further investigated. 
Description type:Original description 
Description:Diagnosis: Asexual morph: Mycelium consisting of smooth, hyaline, branched, septate hyphae measuring 1–4 µm in diam. Conidiophore mother cells hyaline to brown, aggregated in clusters or solitary on hyphae, ampuliform, cylindrical or doliform, 4–11 × 2–5 µm, growing above one or several hyaline cylindrical cells. Conidiophore reduced to a conidiogenous cell. Conidiogenous cells basauxic, polyblastic, sympodial, cylindrical, discrete, sometimes branched, smooth-walled, measuring 6–27 × 2–5 μm (n=25). Conidia globose to ellipsoidal, pale brown to brown, with a thin hyaline germ-slit, 6–8 × 3–5 μm (n=30). Sterile cells eloganted, brown, sometimes mixed among conidia, 13–16 × 4–5 μm (n=30). Culture characteristics: on MEA 2%, colonies flat, spreading, with sparse aerial mycelium, reverse concolor with agar. 
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