NAME Asterothyrites dictyozamiticola
AGE Early Cretaceous.   AGE span: 145.5...99.6 mya
K&J CLASSIFICATION (2000) Ascomycetes, Microthyriales.
FIGURE(S)
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Pl.23fig.6.jpg
FIGURE REFERENCE Krassilov VA. 1967. Early Cretaceous flora of the southern Primorsk and its significance for the stratigraphy (in Russian); Academy of Sciences of the USSR Siberian Branch, Far East Geological Institute, Moscow, 264 p.
SPECIES, AUTHORITY A.? dictyozamiticola (Krassilov) Kalgutkar & Jansonius 2000
LOCATION Southern Primorsk, Russia.
ORIG DESCRIPTION* [Diagnosis] Epiphyllous, circular, thyriothecia, ostiole diameter exceeding half of the overall diameter of thyriothecium. The peripheral part consists of hyphae joined along their lengths. The diameter is up to 90 µm.

[Description]: The above diagnosis is related to mature thyriothecia, the central part of which disintegrates to form a very wide ostiole. Thyriothecia are located individually on the upper cuticle of Dictyozamites grossinervis Yokoyama leaves. Free mycelium is absent. The thyriothecium has a regular form of 90 µm in diameter, the margin is flat and occasionally slightly undulated. The ostiole occupies the entire central part of the ascoma that is 54 µm in diameter. The peripheral part of the thyriothecium is formed by thin, radial hyphae growing jointed along the entire length. There are some other specimens of similar structure indicating that disintegration of the central part and formation of an ostiole in the mature specimens are characteristics of these forms. However, along with the above described forms were found relatively small thyriothecia that had no ostiole and obviously represented young fruiting bodies of the same species.
COMMENTS* The thyriothecia in question are similar to some Notothyrites setiferus Cookson 1947a specimens, but differ from them in ostiole development and absence of hyphae.
PUBLICATION REFERENCE Krassilov VA. 1967. Early Cretaceous flora of the southern Primorsk and its significance for the stratigraphy (in Russian); Academy of Sciences of the USSR Siberian Branch, Far East Geological Institute, Moscow, 264 p.
K&J REMARKS Trichothyrites and Notothyrites are characterized by the presence of a ring of dark, thick-walled cells bordering the ostiole. Figures of Notothyrites dictyozamiticola Krassilov show that these forms have a poorly delineated solution ostiole; Kalgutkar and Jansonius (2000) assign it to Asterothyrites.
TYPE
ALL NAMES (Including synonyms) Notothyrites dictyozamiticola Krassilov 1967, p. 90, pl. 1, fig. 2.; Asterothyrites dictyozamiticola
SERIAL NUMBER 69
PUBLIC COMMENTS
 *For source, see Publication Reference.