GENUS LAEVIGAT0-SP0R1TES 



29 



fourths the total length of the spore. The 

 suture is usually distinct but may be hidden 

 by folds or ornamentation. The lips and 

 small arcuate ridges may be present or 

 absent. The spore coat may range in thick- 

 ness from around 1 micron to 3.5 microns. 



Laevigato-sporites latus sp. nov. 

 Plate 5, figure 11 



Description. — Spores are bilateral, mono- 

 lete, broadly bean to oval shaped in the 

 plane of longitudinal symmetry, oval to 

 round in transverse plane. The holotype 

 measures 63 X 54.6 microns, and the known 

 size variance is from 57 to 66 microns in 

 the longest plane. The spore coat is levi- 

 gate and the monolete mark is distinct, 

 slightly opened, with lips. The monolete 

 mark is less than half the length of the 

 spore. The spore coat is 1.5 to 2 microns 

 thick. 



Holotype. — Maceration 490-A Slide 6, 

 McCleary's bluff coal bed ( 3 l/ 2 "), Wabash 

 County, Illinois. 



Discussion. — L. latus sp. nov. is distinct 

 from all known species in that it is almost 

 as wide as long and also the monolete mark 

 is less than half the length of the spore. 



Laevigato-sporites medius sp. nov. 



Plate 16, figure 2 



Description. — Spores are bilateral, mono- 

 lete, elongate to oval in the plane of longi- 

 tudinal symmetry. The spore coat fre- 

 quently exhibits minor folds but major folds 

 are rare. The holotype measures 42.1 X 

 28.3 microns and the known size range is 

 from 36 to 43 microns in length and from 

 25 to 29 microns in width. The monolete 

 suture averages 25 microns in length. The 

 lips and suture are distinct, and the spore 

 coat appears levigate although it obviously 

 is minutely granular when critically ex- 

 amined. The spore coat is 2 to 2.5 microns 

 thick. 



Holotype.— Maceration 578 Slide 5, 

 Scottville coal bed, Macoupin County, 

 Illinois. 



Discussion. — This species is intermediate 

 in size between the small species of the 

 genus and L. ovalis sp. nov. 



Laevigato-sporites obscurus sp. nov. 

 Plate 16, figure 6 



Description. — Spores are bilateral, mono- 

 lete, broadly oval in outline, and rarely 

 folded. The holotype measures 32 X 29.4 

 microns and the known size range is from 

 28 to 34 microns in the largest diameter. 

 The outline of the spore is irregular due to 

 the sculpturing of the spore coat which is 

 punctate. The punctations are distinct 

 when viewed with low magnification, but 

 are obscure when viewed with high magnif- 

 ication. The monolete suture is usually 

 two-thirds to three-fourths the length of 

 the body and somewhat distorted by the 

 ornamentation. The lips are slightly 

 elevated and the suture is well defined. The 

 spore coat is 2 to 2.25 microns thick. 



Holotype. — Maceration 576 Slide 14, 

 New Haven coal bed, Gallatin County, 

 Illinois. 



Discussion. — This species is closely re- 

 lated to L. thiessenii Kosanke, 1943, and 

 L. pseudothiessenii sp. nov. It differs from 

 these two species in the type of ornamenta- 

 tion, and is larger than L. thiessenii Ko- 

 sanke, 1943. 



Laevigato-sporites ovalis sp. nov. 



Plate 5, figure 7 



Description. — Spores are bilateral, mono- 

 lete, bean shaped to oval in the plane of 

 longitudinal symmetry. Folding of the 

 spore coat is very rare. The holotype meas- 

 ures 63 X 46.2 microns. Thus the width 

 of the spore is about three-fourths of the 

 total length. The known size range is 

 from 45 to 65 microns. The spore coat 

 is distinctly levigate, the monolete mark 

 is half the length of the spore or more and 

 the suture is frequently open. Distinct lips 

 may be observed by focusing to proper ad- 

 justment under high magnification. The 

 spore coat is 2 to 2.5 microns in thickness. 



Holotype. — Maceration 501 -A Slide 1, 

 coal bed at 85 to 87 feet in the Skiles-Price 

 No. 1 well in Wabash County, Illinois. 



Discussion. — L. ovalis sp. nov. is distinct 

 from L. desmoinensis (Wilson and Coe), 

 S. W. and B., 1944, in being shorter and 



