2 Systematic Descriptions
33
Fig. 2.16 a and b Proximal view showing pronounced cavate characteristic. c Side view with
cingulum
Densoisporites sp (Fig. 2.16).
Occurrence: Upper Permian of Collie Basin.
Description: Trilete, cavate and cingulate. Cingulum hyaline, almost transparent,
occasionally torn off. Amb. rounded to triangular rounded. Laesurae simple, long,
extending to or almost to equatorial margin of spore. Exine cavate; endexine
smooth, thin attached on proximal face and detached on distal face. Ektexine about
1 µ thick, thinning out towards proximal face, and thickening equatorially to form
a narrow cingulum about 2 µ wide. Structure of endexine dense, intra-granulate;
grana closely packed. Structure fades out towards proximal face, becoming faint
over contact area.
Dimensions: 40–50 µ (12 specimens measured).
Remarks: Densoisporites described by Backhouse (1991) from Collie Basin has
a clearly defined thicker cingulum. D. sp. has a very fine cingulum, often only a
rudimentary one. On the other hand, D. sp is characterised by a pronounced cavate
appearance. A cavate presence is not visible in the Densoisporites described by
Backhouse. Furthermore, the laesurae in the present specimens of Densoisporites
are not accompanied by folds; when present point to elevated laesurae before
compaction.
Genus Indotriradites (Tiwari) (Foster 1979).
Synonym: Kraeuselisporites (Leschik 1955).
Diagnosis: Zonate, cavate spores. Trilete; laesurae often extending onto flange in
the form of thickenings. Commissures simple, raised. Endexine thin and smooth.
Ektexine structured and sculptured. Structure intra-punctate. Sculpture granulate,
echinate and usually restricted to the distal face. If extending onto proximal face,
elements noticeably reduced in size. Flange smooth or sculptured.
Known distribution: Lower Triassic of Canada (Jansonius 1962), Lower Triassic
of Western Australia (Balme 1963), Permian of New South Wales (Balme and
Hennelly 1956), Triassic of Tasmania (Playford 1965), Lower Coal Measures
of Tanganyika (Hart 1960), Lower Permian of the Barakar coal in India (Tiwari
1964, 1965).
33
Fig. 2.16 a and b Proximal view showing pronounced cavate characteristic. c Side view with
cingulum
Densoisporites sp (Fig. 2.16).
Occurrence: Upper Permian of Collie Basin.
Description: Trilete, cavate and cingulate. Cingulum hyaline, almost transparent,
occasionally torn off. Amb. rounded to triangular rounded. Laesurae simple, long,
extending to or almost to equatorial margin of spore. Exine cavate; endexine
smooth, thin attached on proximal face and detached on distal face. Ektexine about
1 µ thick, thinning out towards proximal face, and thickening equatorially to form
a narrow cingulum about 2 µ wide. Structure of endexine dense, intra-granulate;
grana closely packed. Structure fades out towards proximal face, becoming faint
over contact area.
Dimensions: 40–50 µ (12 specimens measured).
Remarks: Densoisporites described by Backhouse (1991) from Collie Basin has
a clearly defined thicker cingulum. D. sp. has a very fine cingulum, often only a
rudimentary one. On the other hand, D. sp is characterised by a pronounced cavate
appearance. A cavate presence is not visible in the Densoisporites described by
Backhouse. Furthermore, the laesurae in the present specimens of Densoisporites
are not accompanied by folds; when present point to elevated laesurae before
compaction.
Genus Indotriradites (Tiwari) (Foster 1979).
Synonym: Kraeuselisporites (Leschik 1955).
Diagnosis: Zonate, cavate spores. Trilete; laesurae often extending onto flange in
the form of thickenings. Commissures simple, raised. Endexine thin and smooth.
Ektexine structured and sculptured. Structure intra-punctate. Sculpture granulate,
echinate and usually restricted to the distal face. If extending onto proximal face,
elements noticeably reduced in size. Flange smooth or sculptured.
Known distribution: Lower Triassic of Canada (Jansonius 1962), Lower Triassic
of Western Australia (Balme 1963), Permian of New South Wales (Balme and
Hennelly 1956), Triassic of Tasmania (Playford 1965), Lower Coal Measures
of Tanganyika (Hart 1960), Lower Permian of the Barakar coal in India (Tiwari
1964, 1965).