Arthirnium esporlense Pintos & P. Alvarado

Pintos, Angel, Alvarado, Pablo, Planas, Juan & Jarling, Rene, 2019, Six new species of Arthrinium from Europe and notes about A. caricicola and other species found in Carex spp. hosts, MycoKeys 49, pp. 15-48 : 15

Arthirnium esporlense Pintos & P. Alvarado sp. nov. Fig. 7

Etymology.

In reference to Esporles, the village of Mallorca (Spain) where it was found.

Diagnosis.

Asexual morph: Mycelium consisting of smooth, hyaline, branched septate hyphae about 1.5-4 µm in diameter. Conidiophores reduced to conidiogeous cells. Conidiogenous cells polyblastic, aggregated in clusters on hyphae, smooth, hyaline to pale brown, ampuliform, cylindrical or lageniform, measuring 4-22 × 4-8 μm. Conidia brown, smooth, globose with a pale equatorial slit and (8 –)9–12(– 13) µm long in frontal view, lenticular and 6-8 μm long in side view (n = 30). Sterile cells elongated, sometimes mixed among conidia, paler than them. Culture characteristics: colonies flat, spreading, with moderate aerial mycelium, on MEA 2% surface white with yellowish patches, reverse concolour with age.

Type.

Spain: Balearic Islands: Mallorca, Esporles, on dead culms of Phyllostachys aurea , 16 July 2017, A. Pintos (MA-Fungi 91727 holotype, AP16717 isotype, CBS 145136 ex-type culture).

Notes.

Arthrinium esporlense is closely related with A. xenocordella and A. kogelbergense . However, A. esporlense does not produce brown setae as A. xenocordella , a species until now known only from soil samples ( Crous and Groenewald 2013). Arthrinium esporlense morphologically differs from A. kogelbergense by producing slightly bigger conidiogenous cells (4-22 × 4-8 μm vs 5-12 × 4-5 μm). These three species are genetically related (1.00 PP, 96 BP) to the group formed by A. arundinis , A. thailandicum D.Q. Dai & K.D. Hyde, A. malaysianum and the new species A. italicum proposed below.