NAME Ussurithyrites araucariodendri
AGE Early Cretaceous.   AGE span: 145.5...99.6 mya
K&J CLASSIFICATION (2000) Ascomycetes, Microthyriales.
FIGURE(S)
Image of
Pl.25fig.1.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 U. araucariodendri Krassilov 1967, p. 94, pl. 2, fig. 1.
LOCATION Southern Primorsk, Russia.
ORIG DESCRIPTION* [Diagnosis] Ca 112 µm; thyriothecia scattered, epiphyllous, oval, consisting of fanlike spreading hyphae with transverse partitions (septa) forming a paraplectenchymatous membrane. Ostiole elongate oval, with irregular outline, placed in the central part of the stroma. [Jansonius & Hills (1990), card no. 4801.]

[Description]: Some thyriothecia were found on the cuticle of upper epidermis of coniferous Araucariodendron heterophyllum leaves. All of them have an oval form, their size varying between 95-112 µm on the long axis. The margin is usually slightly irregular. The ostiole is centrally located and appears similar to thyriothecia in form, but usually has an irregular outline. Its size reaches 40-50 µm on the long axis. The hyphae forming the thyriothecia grow fan-shaped from one end. Hyphae in the middle part of the scutellum are straight, and near the margins are curved into an arch. Paraplechtenchyma cells have a tetragonal form, the length is up to 6 µm, width about 2 µm.
COMMENTS*
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.

Jansonius J, Hills LV. 1990. Genera file of fossil spores - supplement 10; Special Publication, Department of Geology, University of Calgary, cards 4576-4811.
K&J REMARKS A holotype number is given, but the specimen is not identified in the plate legend or text; pl. 2 fig. 1 is the best preserved specimen, and according to Kalgutkar and Jansonius (2000), most likely represents the holotype; it is here used for Kalgutkar and Jansonius's (2000) illustration.
TYPE
ALL NAMES (Including synonyms) Ussurithyrites araucariodendri
SERIAL NUMBER 1766
PUBLIC COMMENTS
 *For source, see Publication Reference.