23 



Hamiapollenites? sp. 1 

 Plate 3, figure 2 



The pollen grain is bilateral, bisaccate, 

 and has four longitudinal ribs and one trans- 

 verse rib. This species is assigned to Hamia- 

 pollenites with reservations because the genus 

 as described by Wilson has a larger number 

 of ribs than were observed on the single, 

 eroded specimen studied. The specimen also 

 shows some similarity to Protodiploxipinus 

 bullaeformis Samoilovich, 1953. 



Figured specimen. — Negative 5663; Hen- 

 shaw Formation, maceration 1122-Z, slide 

 3 ZB, coordinates, 136.3 X 37.2; size, total 

 length 68.3 [i, body 38.9 by 36.0 /i. 



Genus Illinites Kosanke, 1950 

 Table 1 



Type species. — Illinites unicus Kosanke, 

 1950. 



Affinity. — Probably of gymnospermic origin 

 (Kosanke, 1950, p. 51). 



Genus Indospora Bhardwaj, 1960 

 Plate 3, figures 3-6 



Type species. — Indospora clara Bhardwaj, 

 1960. 



Affinity. — Unknown. 



Indospora stewarti sp. nov. 

 Plate 3, figures 3-4 



Diagnosis. — The spores are radial, trilete, 

 strongly triangular in outline, and often in 

 poor proximal-distal orientation. Corners op- 

 posite the rays are pointed, and the inter- 

 radial sides are straight to slightly convex, 

 occasionally slightly concave. A prominent 

 triradiate ridge about 3 /x, wide is present on 

 the distal side opposite the trilete rays and 

 at the corners extends about 3 /x beyond the 

 margin. The ridges are most prominent on 

 the inner surface of the distal side and are 

 elevated only slightly above the outer distal 

 surface. The trilete rays are usually distinct 

 and extend to the margin of the spore wall. 

 The spore coat is somewhat darker adjacent 

 to the commissure, which is usually open. 

 The spore is often obliquely compressed, dis- 

 placing the rays so they are not exactly op- 



posite the distal ridges. The surface of the 

 spore body is covered with widely distributed 

 fan-shaped projections that are usually di- 

 vided into two or more minute subdivisions 

 at the ends. The major projections are about 

 3 ft long and 2.5 /x wide at their ends. Scat- 

 tered between the major projections are 

 widely spaced, small, circular, cone-shaped 

 projections less than 1 it in diameter. The 

 triradiate ridge has a flat, smooth crest, but 

 under oil immersion objective minute coni 

 can usually be seen along the sides of the 

 ridge. The spore coat is less than 1 /t thick. 

 Dimensions (18 specimens) : size range, 29.5 

 to 38.9 tt in maximum diameter; median, 

 35.7 [i. 



Holotype. — Plate 3, figure 3; negative 6136; 

 Trivoli Cyclothem, maceration 1175-B, slide 

 5, coordinates 132.0 x 46.4; size, 38.9 by 

 37.3 ii. 



Paratype. — Plate 3, figure 4; negative 4791 ; 

 Trivoli Cyclothem, maceration 1128-L, slide 

 19, coordinates, 143.8 X 41.3; size, 35.6 by 

 35.0 it. 



Comparison. — Indospora stewarti is smaller 

 and more angular than /. clara Bhardwaj, 

 1960, and lacks distal polygonal meshes. A 

 single specimen of /. stewarti or a similar 

 species has been noted from Permian strata 

 of Texas by Kosanke (1961, personal com- 

 munication) . 



Derivation of name. — The species is named 

 in honor of Professor Wilson N. Stewart, 

 paleobotanist, University of Illinois. 



Indospora sp. 1 

 Plate 3, figures 5-6 



The spore is radial, trilete, and subtriangu- 

 lar in outline. The commissure is distinct 

 and split open. The rays, which extend to 

 the spore margin, have poorly developed lips. 

 Distal ridges extend about 3 it beyond the 

 margin and are minutely pitted. Finely pitted 

 clavate projections, approximately 3 it long 

 and 3 it in diameter, occur along the in- 

 terradial areas on the proximal surface. 

 Twenty projections extend beyond the mar- 

 gin. 



Figured specimen. — Plate 3, figures 5 and 

 6; negatives 6142 and 6144; Henshaw For- 

 mation, maceration 1122-DD, slide 14, co- 



