NAME Callimothallus assamicus
AGE Tertiary.   AGE span: 65.5...2.588 mya
K&J CLASSIFICATION (2000) Ascomycetes, Microthyriales.
FIGURE(S)
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FIGURE REFERENCE Kar RK, Singh RY, Sah SCD. 1972. On some algal and fungal remains from Tura Formation of Garo Hills, Assam; The Palaeobotanist, v. 19 (1970), p. 146-154.
SPECIES, AUTHORITY C. assamicus Kar, Singh & Sah 1972, p. 151, pl. 2, fig. 19.
LOCATION Damalgiri, Garo Hills, Assam, India.
ORIG DESCRIPTION* Ascomata flattened, subcircular to circular, non-ostiolate, 50-80 µm. Ascomata generally dark brown in color, margin entire or slightly uneven due to setae. Central cells triangular to polygonal from which radiating rows of cells extend outwards. Central cells porate, pores single, outward cells radially elongated. Cells of peripheral region thicker and slightly crenate in some specimens.

EMENDED DESCRIPTION (Saxena, Sarkar & Singh 1984, p. 188): Ascostromata subcircular; size ca. 140 x 100 µm. Non-ostiolate, margin wavy, central cells more or less circular in shape, marginal cells bigger in size and rectangular in shape, a small circular pore present in each cell of the central region, margin of the individual cell thickened.
COMMENTS* (Kar, Singh & Sah): Callimothallus assamicus closely resembles C. pertusus Dilcher 1965 in its shape and size-range, but the latter is distinguished by the presence of pores in almost all cells except a few in the periphery. Callimothallus quilonensis Jain & Gupta 1970 has pores only in the outer cells. Pseudosphaerialites described by Venkatachala & Kar (1969) from the Tertiary sediments of Kutch is closely comparable to Callimothallus Dilcher 1965 and in all probability is a junior synonym of Callimothallus.
PUBLICATION REFERENCE Kar RK, Singh RY, Sah SCD. 1972. On some algal and fungal remains from Tura Formation of Garo Hills, Assam; The Palaeobotanist, v. 19 (1970), p. 146-154.
K&J REMARKS Kalgutkar and Jansonius (2000) do not accept the transfer of C. assamicus to the genus Phragmothyrites by Kar & Saxena (1976); see REMARKS from Kalgutkar & Jansonius (2000) under the genus Phragmothyrites.
TYPE
ALL NAMES (Including synonyms) Callimothallus assamicus
SERIAL NUMBER 151
PUBLIC COMMENTS
 *For source, see Publication Reference.