14 



Derivation of name. — The species name re- 

 fers to its distinctive protruding (exertus) 

 distal projection. 



Genus Alatisporites (Ibrahim) Schopf, 

 Wilson, & Bentall, 1944 



Type species. — Alatisporites pustulatus 

 (Ibrahim, 1932) Ibrahim, 1933. 



Affinity. — Cordaitales? (Potonie and 

 Kremp, 1954, p. 170). 



Alatisporites cf. hoffmeisterii 

 Morgan, 1955 



Except for the presence of verrucae on the 

 bladders, the few specimens of Alatisporites 

 cf. hoffmeisterii observed are very similar to 

 those illustrated by Morgan (1955). 



Genus Cadiospora Kosanke, 1950 



Type species. — Cadiospora magna Kosanke, 

 1950. 



Affinity. — Unknown. 



Cadiospora magna Kosanke, 1950 



Although specimens of Cadiospora magna 

 encountered in this study were somewhat 

 smaller (68.1 to 93.9^) than those described 

 by Kosanke (1950, p. 50) as 111.3 to 117.6 ^ 

 it did not seem advisable to erect a new 

 species at present solely on this basis. 



Cadiospora fithiana sp. nov. 

 Plate 1, figures 3-4 



Diagnosis. — The spores are radial, trilete, 

 roundly triangular to circular in outline, and 

 in good proximal-distal orientation. The rays, 

 24 to 29 /x long, are distinct. The lips are 

 prominent, somewhat sinuous, and usually 

 have a single swelling near the proximal pole. 

 The lips rise abruptly above the proximal 

 surface and are 3 to 6.5 /x wide on either side 

 of the rays. They bifurcate at their termini 

 to form distinct arcuate ridges, which are 

 usually plicated parallel to the margin of the 

 spore coat. Part of the arcuate ridge is oc- 

 casionally torn and overlapped onto the body 

 toward the poles. The surface of the spore 

 coat is minutely punctate to granulate viewed 

 under oil immersion objective. The spore 



coat is 3 to 4 fi thick. Dimensions (9 speci- 

 mens) : size range, 56.3 to 75.2 /x in maximum 

 diameter; median, 67.5 /i. 



Holotype. — Plate 1, figure 3; negative 5700; 

 Fithian Cyclothem, maceration 1170-A, slide 

 2, coordinates, 124.9 X 46.1; size, 57.0 by 

 56.7 /x. 



Paratype. — Plate 1, figure 4; negative 6139; 

 Fithian Cyclothem, maceration 1170-A, slide 

 22, coordinates, 126.0 x 37.9; size, 74.5 by 

 70.3 fi. 



Comparison. — Cadiospora magna Kosanke, 

 1950, has broader lips that rise gradually to 

 the rays and a finer surface ornamentation 

 than C. fithiana. C. fithiana is also distin- 

 guished from C. magna by the minor folds 

 usually present in the former. 



Derivation of name. — The species name 

 refers to the Fithian Cyclothem. 



Genus Calamospora Schopf, Wilson, 

 & Bentall, 1944 



Type species. — Calamospora hartungiana 

 Schopf {in Schopf, Wilson, & Bentall, 1944). 



Affinity. — Calamarian (Schopf, Wilson, & 

 Bentall, 1944, p. 50). Arnold (1944) re- 

 ported spores of the Calamospora type from 

 a fructification of Bowmanites. Fructifica- 

 tions of Palaeostachya decacnema Delevoryas 

 (1955, p. 483), Sphenophyllum hauchecor- 

 nei (Weiss) Remy (1955, pi. 12), Anastachys 

 {Sphenophyllum) caudata Weiss (Remy, 

 1955, pi. 12), several species of Koinostachys 

 {Sphenophyllum) Remy (1955, p. 29-33, 

 pis. 12-13), and Eleutherophyllum drepano- 

 phyciforme Remy & Remy (1960, p. 89-100), 

 yielded spores that would be assigned to 

 Calamospora if found isolated. Baxter (1963, 

 p. 473-475, figs. 10-13) described and illus- 

 trated spores of the Calamospora type from 

 a new heterosporous calamitean cone, Ca- 

 lamocarpon insignis from the middle Pennsyl- 

 vanian of Kansas and Iowa. 



Calamospora obscura sp. nov. 

 Plate 1, figures 5-6 



Diagnosis. — The spores are radial, original- 

 ly spherical, and have numerous major folds 

 throughout, but especially around the mar- 

 gin. The rays arc very indistinct; in fact, 

 only a few specimens show structures, at least 



