36 



Punctatisporites sp. 5 

 Plate 5, figure 11 



The spore is radial, trilete, and subcircular 

 in outline. The rays are distinct, straight, and 

 about 17 fi long. The lips on either side of 

 the commissure are low and about 2.5 /x wide. 

 Interray areas are slightly thinner than the 

 rest of the spore coat, which is about 2 [i 

 thick. Because it is covered with grana of 

 irregular size and shape, the spore coat has 

 a very rough appearance. 



Figured specimen. — Negative 5672; Hen- 

 shaw Formation, maceration 1122-Z, slide 8 

 ZB, coordinates, 125.4 X 31.4; size, 96.7 by 

 85.3 fi. 



Punctatisporites sp. 6 

 Plate 5, figure 12 



The spore is radial, trilete, and roundly 

 triangular in outline. The rays extend to the 

 spore margin but are indistinct due to orna- 

 mentation. The surface of the spore coat is 

 covered with closely spaced, flat, pointed 

 spines connected by ridges. About 30 spines, 

 2 to 3 p. in length and width, extend beyond 

 the spore margin. The exine is about 2 ^ 

 thick. 



Figured specimen. — Negative 5603; Hen- 

 shaw Formation, maceration 1122-A, slide 

 22 ZB, coordinates, 126.9 x 45.0; size, 38.9 

 by 35.7 /x. 



Genus Raistrigkia, Schopf, Wilson, & 



Bentall, 1944 



Plate 5, figures 13-15; plate 6, 



figures 1-2; text figure 10 



Type species. — Raistrickia grovensis Schopf, 

 Wilson, & Bentall, 1944. 



Affinities. — Filicinean (Schopf, Wilson, and 

 Bentall, 1944, p. 55). Mamay (1950, p. 415) 

 described Botryopteris spinosa which yielded 

 Raistrickia-type spores. The occurrence of 

 Raistrickia in sporangia of Senjtenbergia 

 (Pecopteris) plumosa Artis was well de- 

 scribed and illustrated by Remy and Remy 

 (1955, p. 44-45, pi. 15). 



The trilete rays extend to the margin and are 

 without lips. The proximal and distal sur- 

 faces are ornamented with club-shaped proc- 

 esses and a few processes of uniform width 

 that are minutely serrate at their apices. Some 

 of the processes are divided into two or more 

 major divisions (text fig. 10) . The processes 

 are up to 6 fx long and range from 1 to 7 //, 

 in width, with 3 /i as the average. From 20 

 to 35 processes extend beyond the spore mar- 

 gin. Between the processes, the surface of 

 the spore coat is levigate under oil immersion 



FIG. 10 — Diagrammatic detail of portion of exine 

 of Raistrickia kentuckiensis sp. nov. 



objective. The spore coat is 1.5 to 2 ju, thick. 

 Dimensions (6 specimens) : size range, 45.3 

 to 53.0 /x in maximum diameter; median, 

 49.0 ^ 



Holotype. — Plate 5, figure 13; negative 

 6150; Henshaw Formation, maceration 1122- 

 Z, slide 8 ZB, coordinates, 127.1 X 44.9; 

 size, 47.9 by 42.8 /x (not including ornamen- 

 tation) . 



Paratype. — Plate 5, figure 14; negative 

 6508; Henshaw Formation, maceration 1122- 

 Z, slide 14, coordinates, 132.3 X 31.7; size, 

 52.0 by 48.8 /x. 



Comparison. — Raistrickia kentuckiensis has 

 more numerous, more uniform, and longer 

 processes than R. superb a (Ibrahim) Schopf, 

 Wilson, & Bentall, 1944, which it most closely 

 resembles. The processes of R. superba are 

 often conical shaped. R. kentuckiensis is sim- 

 ilar to the specimen designated by Bhardwaj 

 (1957b, pi. 23, fig. 31) as R. cf. superba, 

 except that the latter has ravs that do not 

 reach the spore margin. 



Derivation of name. — The species name re- 

 fers to the state of Kentucky. 



Raistrickia kentuckiensis sp. nov. 

 Plate 5, figures 13-14; text figure 10 



Diagnosis. — The spores are radial, trilete, 

 and circular to roundly triangular in outline. 



Raistrickia sp. 1 

 Plate 5, figure 15 



The spores are radial, trilete, and subcir- 

 cular in outline because of folding. The tri- 



