NAME Phragmothyrites otozamiticola
AGE Early Cretaceous.   AGE span: 145.5...99.6 mya
K&J CLASSIFICATION (2000) Ascomycetes, Microthyriales.
FIGURE(S)
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Pl.21fig.3.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 P. otozamiticola (Krassilov) Kalgutkar & Jansonius 2000
LOCATION Southern Primorsk, Russia.
ORIG DESCRIPTION* [Diagnosis] Thyriothecia are individually located, epiphyllous, round, without ostiole, have a group of small isodiametric central cells in the center of ascoma. The diameter is 50 µm.

[Description]: Small thyriothecia with the diameter less than 50 µm were found on the cuticle of upper epidermis of bennettite Otozamites leaves. Free mycelium was absent. Thyriothecia had no ostiole (it is possible they were not completely developed). A group of isodiametric cells of an irregular tetragonal form and of about 4 µm, located in the centers of each ascoma. Hyphae have partitions forming a plectenchyma with large (in comparison with the dimension of the entire body) cells of about 9 µm in length and 4-5 µm in width. They grow concentrically from the cells. Margin of the ascomata is uniform, with occasional small undulations.
COMMENTS* The described thyriothecia are similar to Microthyriacites grandis Cookson 1947a and M. cooksoniae Rao 1959, but differ from them in much smaller size and less distinctive group of central cells.
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 Notothyrites otozamiticola Krassilov (pl. 1, fig. 8) lacks an ostiole surrounded by a tissue of thick-walled cells, which characterizes the genus Trichothyrites Rosendahl 1943 (in which Kalgutkar and Jansonius (2000) include Nothothyrites Cookson 1947). The illustrated specimen appears similar to the ascomata of Phragmothyrites, in which Kalgutkar and Jansonius (2000) include Microthallites Dilcher 1965.

Microthyriacites Cookson 1947a is characterized by the presence of a distinctive group of thick-walled cells in the centre of the ascoma.
TYPE
ALL NAMES (Including synonyms) Notothyrites otozamiticola Krassilov 1967, p. 92, pl. 1, fig. 8.; Phragmothyrites otozamiticola
SERIAL NUMBER 1329
PUBLIC COMMENTS
 *For source, see Publication Reference.