(Kohlm. & Kohlm.) Kohlm. & Volkm.-Kohlm. Mycol. Res. 97: 759 (1993)
Sordariomycetes, subclass Hypocreomycetidae
Sexual morph. Ascomata 275-380 μm high, 315-460μm diam., subglobose or depressed-ellipsoidal, partly or rarelycompletely immersed, ostiolate, epapillate or clypeoid thickened around the ostiole, fleshy-leathery, orange-yellowish, gregarious, or frequently confluent. Necks 17.5-32.5 μm diam., conical, lined with periphyses, 1-2 μm diam. Peridium above and at the sides 70-75 μm thick, at the base 20-30 μm, two-layered, outer layer composed of irregularly polygonal, thick-walled cells of textura angularis, inner layer of elongate, flattened cells that merge into paraphyses. Apical paraphyses 2 μm diam., septate, in the dome of the venter attached to large isodiametric cells with large lumina, finally deliquescing. Asci 90-105 × 15-23 μm, eight-spored, clavate or subcylindrical, short pedunculate, unitunicate, thin-walled at maturity, without apical apparatus, developing at the base of the ascoma venter. Ascospores 17-26 × 8.5-13 μm, uni- or biseriate, ellipsoidal or ovoid, 1-septate somewhat below the centre, slightly constricted at the septum, hyaline, with about six longitudinal ridges, 0.5-0.8 μm diam., running around the spore from one pole to the other. Asexual morph: Undetermined.
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Key to Kallichroma species:
- Ascomata orange in colour, over 250 μm in size 2
- Ascomata hyaline, less than 250 μm in size K. ellipsoideum
- Ascomata epapillate, asci are always 8-spored 3
- Ascomata with large globose papillae, asci 3 to 8-spored K. asperum
- Ascospores with longitudinal ridges on the cell wall K. tethys
- Ascospores lack longitudinal ridges on the cell wall K. glabrum
Image: Kallichroma tethys. (a) Section of erumpent, globose ascoma. (b) Two-layered peridium, outer layer of cells of textura angularis, inner layer of elongated cells. (c) Subcylindrical ascus with hyaline ascospores. (d) Bicelled, hyaline ascospore with cells unequal in length. (e)
Ridges on ascospore wall. Scale bar: a=50 μm; b, c, d, e=10 μm. Photo reproduced with the permission of the National Taiwan Ocean University.