60 



ILLINOIS STATE GEOLOGICAL SURVEY 



(maceration 599B) and in the DeKoven 

 (?) Coal (maceration 554D) . Calamospora 

 megaspores are also present in the Jagger, 

 Blue Creek, and Newcastle Coals of the 

 Mary Lee Group in the Warrior Basin of 

 Alabama. 



Calamospora sinuosa (Potonie and 

 Kremp) ex Horst, 1955 



1955 Calamospora (Triletes) sinuosa (Horst, 1943, 

 fig. 3) Potoni6 and Kremp, p. 48 (nom. 

 nudum). 



1955 Calamospora sinuosa (Horst) Potonie and 

 Kremp, in Horst, p. 155-156; pi. 17, fig. 3. 



Calamospora cf. C. sinuosa 

 Plate 13, figure 10 



Description. — Spores large, originally 

 nearly spherical, developing many taper- 

 point folds upon compression. Maximum 

 diameter ranging from 610 to 1020 ^ (mean 

 804 p for 17 measured specimens). Trilete 

 rays one-third to one-half the spore radius 

 in length with lips up to 20 ^ in height. 

 Trilete mark usually incorporated into 

 taper-point folds. Contact areas not differ- 

 entiated by spore coat thickening or change 

 in spore coat texture. Spore coat ranging 

 from 6 to 13 /x in thickness, golden yellow 

 to brownish yellow by transmitted light, 

 glossy by reflected light. 



Discussion. — These spores are of the 

 same size as those described by Horst 

 (1955) but may have slightly higher lips 

 and apparently do not show the infra- 

 granulate texture of the contact area de- 

 scribed by him. Horst's (1955) suggestion 

 that the spores described as Sporites plica- 

 tus by Schopf (1938) could be referable to 

 Calamospora sinuosa is untenable. Similar 

 megaspores are described by Arnold (1944) 

 from a sphenophyllaceous fructification, 

 Bowmanites delectus, found in a shale be- 

 low Cycle "A" at Grand Ledge, Michigan. 

 The larger spores range from 660 to 750 ^ 

 in maximum diameter and some of the 

 abortive spores are one-third this size. 

 Those illustrated by Arnold (1944, figs. 4, 

 7) appear very similar to the one shown 

 by figure 10 on plate 13. 



Horst (1955) originally described this 

 species from the Namurian A of Mahrisch- 

 Ostrau and west Upper Silesia. 



Occurrence. — These spores are common 

 to present in the Willis Coal (macerations 

 625 A-B, 631) and rare in the Tarter (mac- 

 eration 604A) and Babylon (maceration 

 523 A) Coals of the Tradewater Group. 



Calamospora laevigata (Ibrahim) 

 Schopf, Wilson, and Bentall, 1944 



1933 Laevigati-sporites laevigatus Ibrahim, p. 17; 

 pi. 6, fig. 46. 



1934 Laevigati-sporites laevigatus Ibrahim, in 

 Loose, p. 146; pi. 7, fig. 36. 



1934 (Calamitif)-sporites laevigatus Ibrahim, in 



Wicher (1934a), p. 172. 

 1944 Calamospora laevigatus (Ibrahim) Schopf, 



Wilson, and Bentall, p. 52. 



Calamospora cf. C. laevigata 



Plate 13, figure 11 



Description. — Spores originally more or 

 less spherical, when compressed developing 

 characteristic taper-point folds, maximum 

 diameter ranging from 270 to 445 p (mean 

 336 ii for 19 specimens) . Trilete rays short, 

 ranging in length from 15 to 30 percent of 

 the spore radius. Labial development usu- 

 ally not obvious. Contact areas sometimes 

 appearing punctate (pi. 13, fig. 11). Spore 

 coat ranging from 2 to 10^ in thickness, 

 thicker and darker at contact areas, golden 

 yellow by transmitted light. 



Discussion. — These spores, which may 

 represent several different plants, at pres- 

 ent seem to lack distinguishable features. 

 They may not properly be referable to C. 

 laevigata, because Potonie and Kremp 

 (1955) stated that there is no contact area 

 differentiation on spores of this species. 

 The size range of the Illinois spores is iden- 

 tical to that given by both Potonie and 

 Kremp (1955) and by Horst (1955) . How- 

 ever, the coat thickness of the Illinois 

 spores ranges from less than to greater 

 than the limits given by these authors. 



Horst (1955) recorded Calamospora 

 laevigata from the Namurian A of the 

 Mahrisch-Ostrau region and from the West- 

 phalian A of the west Upper Silesian re- 

 gion. Potonie and Kremp (1955) recorded 

 this species from the Upper Westphalian B 

 of the Ruhr Basin. 



Occurrence. — These spores are present to 

 rare in Caseyville coals (macerations 795, 



