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Pleosporales - CBS - KNAW

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Fungal Diversity<br />

Fig. 93 Verruculina enalia (from KDH 2137, slide). a Cylindrical asci with short pedicels. b One-septate verruculose ascospores. Scale bars:<br />

a=20 μm, b=10 μm<br />

van der Aa (1987) andBarr(2000) acceptedWesterdykella as<br />

a separate genus, but this is not supported by molecular<br />

phylogenetic analysis (Kruys and Wedin 2009).<br />

Phylogenetic study<br />

Phylogenetic reconstructions indicated that both Pycnidiophora<br />

and Eremodothis should be treated as synonyms<br />

of Westerdykella (Kruys and Wedin 2009).<br />

Concluding remarks<br />

Westerdykella is another example where ascospore ornamentation<br />

can be phylogenetically uninformative. Westerdykella<br />

is proved a good genus of Sporormiaceae (Kruys and Wedin<br />

2009).<br />

Wettsteinina Höhn., Sber. Akad. Wiss. Wien, Math.-naturw.<br />

Kl., Abt. I 116: 126 (1907). (?Lentitheciaceae)<br />

Generic description<br />

Habitat terrestrial or freshwater? hemibiotrophic or<br />

saprobic. Ascomata generally small, scattered, immersed<br />

with a protruding broad papilla. Peridium very thin,<br />

composed of few layers of thin-walled large polygonal<br />

cells in surface view. Hamathecium deliquescing at<br />

maturity. Asci bitunicate, fissitunicate, subglobose to<br />

obpyriform, without a pedicel, with small truncate ocular<br />

chamber. Ascospores hyaline and turning pale brown<br />

when mature, septate, upper second cell enlarged, slightly<br />

constricted at the second septum, smooth, surrounded by a<br />

hyaline gelatinous sheath.<br />

Anamorph reported for genus: Stagonospora (Farr et al.<br />

1989).<br />

Literature: Barr 1972; Müller 1950; Shoemaker and<br />

Babcock 1987, 1989b.<br />

Type species<br />

Wettsteinina gigaspora Höhn., Sber. Akad. Wiss. Wien,<br />

Math.-naturw. Kl., Abt. 1 116: 126 (1907). (Fig. 95)<br />

Ascomata 150–250 μm diam., scattered, immersed<br />

with protruding broad papillae, 50–90 μm diam.<br />

Peridium thin, composed of few layers of thin-walled<br />

large polygonal cells in surface view, 6–15 μm diam.<br />

(Fig. 95a). Hamathecium deliquescing at maturity. Asci<br />

140–200×75–120 μm, 8-spored, bitunicate, fissitunicate,<br />

subglobose to obpyriform, lacking a pedicel, with a small<br />

truncate ocular chamber (to 8 μm wide×5 μm high)<br />

(Fig. 95b and c). Ascospores 90–110×25–30 μm, 2–4-<br />

seriate, hyaline and turning pale brown when mature,<br />

broadly clavate, 4-septate, primary septum distinct and<br />

constricted forming 1/3 rd from the apex of the ascospore,<br />

complete, secondary septa less distinct and slightly<br />

constricted, incomplete, with one forming above and two<br />

forming below the primary septum, largest cell the second<br />

cell from apex, smooth, surrounded by a hyaline gelatinous<br />

sheath 5–8 μm thick (Fig. 95d and e).<br />

Anamorph: none reported.<br />

Material examined: SLOVENIA, Postojna, on Genista<br />

sagittalis leg. Stapf. det. H. Rehm. (S, holotype of<br />

Massarina gigantospora).

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