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 Add this item to the list  810150 Original description
Description type:Original description 
Description:Perithecia formed heterothallically in vitro, disposed solitarily or in groups, developing directly on the agar surface or on sterile pieces of birch wood, ovoid to obpyriform, dark-red, becoming purple-red in 3 % KOH (positive colour reaction), smooth to finely warted, 220e270 300e350 mm high when rehydrated; without recognisable stroma; perithecial wall consisting of two poorly distinguishable regions; outer region 18e35 mm thick, composed of 1e3 layers of angular to subglobose cells, 9e30 5e17 mm; cell walls up to 2 mm thick; inner region up to 15 mm thick, composed of cells that are flat in transverse optical section and angular to oval in subsurface optical face view; walls in the outer and inner region sometimes locally thinning to form pseudopores in conjunction with matching structures in adjacent cells; Asci clavate to narrowly clavate, ca. 55e65 8e10 mm, eight-spored; apex rounded, witha minutely visible ring. Ascospores divided into two cells of equal size, ellipsoidal to oblong-ellipsoidal, somewhat tapering towards the ends, smooth to finely warted, (10.9e) 13.5(e15.2) (3.3e)4.2(e6.3) mm. Fertile matings: Perithecia observed after 4 wk in crossings of strains: CBS 113552 CBS 112593; CBS 113552 Cy130; CBS 113552 CBS 112608. Conidiophores simple or complex, sporodochial. Simple conidiophores arising laterally or terminally fromaerialmycelium, solitary to loosely aggregated, unbranched or sparsely branched, bearing up to three phialides, 1e4-septate, 40e150 mm long; phialides monophialidic, more or less cylindrical, but tapering slightly in the upper part towards the apex, 20e45 mm long, 2.0e3.5 mm wide at the base, 2.5e3.5 mm at the widest point, and 1.5e2.5 mm wide at the apex. Complex conidiophores aggregated in small sporodochia, repeatedly and irregularly branched; phialides more or less cylindrical, but tapering slightly in the upper part towards the apex, or narrowly flaskshaped, mostly with the widest point near the middle, 15e23 mm long, 2.5e3.5 mm wide at the base, 2.5e4.0 mm at the widest point, and 1.5e2.5 mmwide at the apex.Macroconidia predominant, formed on both types of conidiophores; on SNA formed in flat domes of slimy masses, (1e)3(e4)-septate, straight or minutely curved, cylindrical or minutely widening towards the tip, appearing somewhat clavate, particularly when still attached to the phialide; apex or apical cell typically slightly bent to one side and minutely beaked; base mostly with a visible, centrally located or laterally displaced hilum; one-septate conidia (20.0e)26.1e27.4e28.7(e42.0) (4.0e) 5.2e5.4e5.6(e7.0) mm with a length : width ratio of (3.8e) 4.9e5.1e5.2(e7.0); two-septate conidia (22.0e)27.9e29.1e 30.3(e40.0) (5.0e)5.6e5.8e6.0(e7.0) mm, with a length:width ratio of (3.7e)4.9e5.1e5.2(e6.2) mm, and three-septate conidia (23.0e)36.8e38.4e40.3(e55.0) (5.0e)6.3e6.5e6.8(e8.5) mm, with a length:width ratio of (4.6e)5.7e5.9e6.2(e8.7) mm. Microconidia 0e1-septate, ellipsoid to ovoid, more or less straight, with a minutely or clearly laterally displaced hilum, constricted at the septum; zero-septate microconidia (6.0e)9.8e10.5e 11.3(e17.0) (3.5e)4.0e4.1e4.2(e5.0) mm, with a length : width ratio of (1.5e)2.4e2.6e2.8(e4.3); one-septate conidia (10.0e) 14.1e14.7e15.3(e19.0) (3.5e)4.3e4.4e4.5(e5.0) mm, with a length:width ratio of (2.4e)3.2e3.3e3.5(e4.8) mm. Conidia formed in heads on simple conidiophores or as white (OA) or unpigmented (SNA) masses as well as on complex conidiophores. Chlamydospores rarely occur, globose to subglobose, 7e11 6e8 mm, smooth but often appearing rough due to deposits, thick-walled, mostly occurring in chains. 
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