GENUS TRIQUITRITES 



37 



exosporial body wall is punctate while the 

 internal bladder ornamentation is coarsely 

 punctate to finely reticulate. The trilete 

 rays are distinct and extend to the margin 

 of the body wall. Occasionally, the folding 

 of the bladder may appear as extensions of 

 the rays. The lips are elevated and the com- 

 missure is thin but distinct. A thickening 

 of the bladder may correspond to arcuate 

 ridges. The exosporial wall is not over two 

 microns in thickness and the bladder is much 

 less. 



Holotype. — Maceration 490-A Slide 5, 

 McCleary's Bluff coal bed (3]/ 2 inches), 

 Wabash County, Illinois. 



Discussion. — E. formosus is distinct from 

 E. angulatus Wilson and Coe, 1940, based 

 on size and ornamentation. It is distinct 

 from E. ornatus Wilson and Coe, 1940, 

 based on shape and ornamentation. 



Endosporites vesicatus sp. nov. 

 Plate 7, figure 8 



Description. — Spores are radial, trilete, 

 originally spherical in transverse plane with 

 exceptionally large bladders. The bladders 

 (perisporial) appear to be inflated and 

 variously folded ; frequently they are folded 

 over the exosporial body wall which itself 

 is rarely folded. The holotype measures 

 73.5 X 136.5 microns, and originally must 

 have measured at least 130 X 130 microns. 

 The exosporial body measures 44 X 52.5 

 microns and the maximum size observed 

 measured 148 microns (including bladder) 

 in the largest diameter. The exosporial 

 body is minutely punctate to finely reticu- 

 late. The trilete mark is fairly distinct 

 and the lips are slightly elevated while the 

 commissure is thin but clearly marked. The 

 rays extend at least three-fourths of the 

 distance to the margin of the exosporial 

 body, and apical papillae are usually pres- 

 ent. The exosporial body does not exceed 

 2 microns in thickness and the bladder is 

 about 1 micron thick. 



Holo type.— Maceration 542-B Slide 1, 

 No. 8 coal bed, Peoria County, Illinois. 



Discussion. — This species is characterized 

 by large folded bladders and the presence of 

 apical papillae. 



Endosporites plicatus sp. nov. 

 Plate 7, figure 7 



Description. — Spores are radial, trilete, 

 spherical in transverse plane with a small 

 perisporial bladder. Folding of the exo- 

 sporial body and bladder is common and the 

 folds are usually parallel to the outline and 

 are most numerous at the juncture of the 

 perisporial and exosporial coats. The holo- 

 type measures 86.1 X 81.4 microns and the 

 known size range is from 78 to 99 microns. 

 The exosporial body measures 63 X 56.7 

 microns, and is punctate with distinct apical 

 papillae. The internal bladder ornamenta- 

 tion is punctate to finely reticulate. The 

 trilete mark is distinct and extends from 

 two-thirds to three-fourths of the distance 

 to the margin of the exosporial body. The 

 commissure is frequently wide and the lips 

 are elevated. The exosporial wall is 1.75 

 to 2.25 microns in thickness; the bladders 

 are about 1 micron thick. 



Holotype. — Maceration 573 Slide 6, No. 

 8 coal bed, Macoupin County, Illinois. 



Discussion. — The presence of apical papil- 

 lae and a small bladder characterize this 

 species. 



GENUS Triquitrites Wilson and Coe, 

 1940 



Plate 8, figures 1-8 



Triquitrites has a long vertical range, but 

 is an important spore genus in Illinois coal 

 beds. It has been isolated from almost all 

 macerations that have been run. The genus 

 had periods of numerical abundance in 

 upper Tradewater and middle McLeans- 

 boro time. 



Triquitrites has been observed in almost 

 all the Pennsylvanian coal beds studied in 

 the United States and in Europe, and is 

 readily recognized, which is a definite asset 

 in the correlation of coal beds. Specific 

 identification is likewise easy to establish, 

 and the new species described in this report 

 expand the known types of ornamentation 

 and arcuate thickenings. 



The following description of the genus 

 Triquitrites is based on six previously de- 

 scribed species and seven new species : Spores 



