Polycyclina rhytismoides
Polycyclina rhytismoides (Speg.) Theiss. & Syd., Annls mycol. 13(3/4): 212 (1915).
≡ Hysterostomella rhytismoides Speg., Boln Acad. nac. Cienc. Córdoba 11(4): 580 (1889).
Index Fungorum number: IF 206969; Facesoffungi number: FoF02325, Fig. 1
Description:
Saprobic on leaves. Sexual morph: Colonies foliicolous, superficial to erumpent, dark brown to black, carbonaceous, usually occur at the edge of the leaves. Ascostromata 1000−1200 µm high, 1100−1150 µm diam., solitary to gregarious, or in groups, superficial to immersed, roundish, with a circular, shield-like, dome-like, flattened, multilocular, brown to black, lacking a distinct central ostiole. Locules 35−65 × 65−75 µm (x̄ = 49.7 × 71.2 µm, n = 10), immersed in ascostromata or in longitudinal ridges radiating from the centre. Upper wall comprising radiating parallel cells, cells at margin branching; in section. Peridium 7.5−15.5 µm thin to thick, composed of pale to dark brown cells of textura globulosa. Hamathecium 3.2−4.5 µm comprising scarce cellular pseudoparaphyses. Asci 29−35 × 10−15 µm (x̄ = 37.1 × 11.5 µm, n = 10), 8-spored, bitunicate, fissitunicate, long ovate, broad cylindrical, broad-clavate, or obclavate, globose to subglobose, short pedicellate, with an indistinct ocular chamber. Ascospores 10−13 × 5.5−5.7 µm (x̄ = 12.7 × 5.7 µm, n = 10), 2– multi-seriate, hyaline oblong to ellipsoid, ellipsoid to ovate, ends rounded, aseptate, wall smooth to verrucose. Asexual morph: Unknown.
Material examined: Venezuela, road from Caracas to Colonia, on Lomaria imperialis (Blechnaceae), Whetzel, Muller and Tamayo, 19 March 1939 (CUP-VZ-003029).
Fig. 1 Polycyclina rhytismoides (CUP-VZ-003029). a–d Herbarium material and appearance of ascostromata on host substrate. e Squash mount of ascostromata showing radiating parallel cells. f Section through ascostromata. g Locules. h Peridium. i–l Asci. m–t Ascospores. Scale bars: c = 5000 μm, d = 1000 μm, e = 40 μm, f, g =50 μm, h, m–t = 10 μm, i–l = 20 μm.
Importance and distribution
Polycyclina comprises only one species known on living leaves of Lomaria imperialis (Pteridophyta) in South America (Brazil-São Paulo).
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