32 



PENNSYLVANIA^ SPORES OE ILLINOIS 



thicker equatorial portion of the spore coat 

 is characteristic of this species. Figure 1, 

 plate 6, is in focus to show the trilete mark 

 and ornamentation whereas figure 2 illus- 

 trates the triangular outline of some speci- 

 mens. 



Denso-sporites glandulosus sp. nov. 

 Plate 6, figure 3 



Description. — Spores are radial, trilete 

 (?), originally spheroid, and frequently 

 compressed to a suboval shape in the trans- 

 verse plane. The holotype measures 27.3 

 X 35.7 microns, and the known size range 

 is from 25 to 38 microns. The proximal 

 and distal portions of the spore coat are 

 minutely granulose as seen with the aid of 

 oil immersion, and there are also scattered 

 about a number of stalked glandulose struc- 

 tures which extend also on the thicker 

 equatorial portion of the spore coat. The 

 glandulose projections average about 4.2 

 microns in length, 1-2 microns at the apex, 

 and usually much less at the base because 

 the projections are knobbed. A faint mark, 

 probably the trilete mark, has been observed. 

 The proximal and distal portions of the 

 spore coat do not exceed 2 microns and the 

 equatorial portion is 4.2 to 7.8 microns in 

 thickness. 



Holotype. — Maceration 144 Slide 5, 

 "Sub-Babylon" coal bed, Fulton County, 

 Illinois. 



Discussion. — The glandulose nature of 

 the entire spore coat is distinctive of this 

 species. The glandulose projections are 

 similar in shape to those of Lyginopteris 

 oldhamia. 



Denso-sporites granulosus sp. nov. 



Plate 6, figure 8 



Description. — Spores are radial, trilete, 

 oval to round in transverse outline and 

 with occasional folds on the proximal sur- 

 face of the spore. The holotype measures 

 52.5 X 48.3 microns and the known size 

 variation is from 45 to 56 microns. The 

 proximal surface of the spore coat is covered 

 with small blunt granulose structures. The 

 equatorial area is opaque with minor spine- 



like projections located at the equator of 

 the spore. A few pits have been observed 

 in the opaque area. The trilete mark is not 

 prominent and the rays sometimes extend 

 into the equatorial portion of the spore coat. 

 The rays average about 16.8 microns in 

 length. The proximal and distal portions 

 of the spore coat are less than 2 microns 

 in thickness while the equatorial portion 

 varies from 7.6 to 12.6 microns which may 

 in part be due to oblique compression. A 

 direct transverse measure of the holotype 

 reveals that over 40 percent of the spore 

 is the equatorial portion of the spore coat. 



Holotype. — Maceration 625-A Slide 6, 

 Willis coal bed, Gallatin County, Illinois. 



Discussion. — D. granulosus sp. nov. is 

 similar in size and shape to D. densus Berry, 

 1937; however, the proximal-distal portion 

 of the spore coat is definitely granulose. 

 Type A, of Raistrick (1947, page 911), is 

 somewhat similar to D. granulosus sp. nov. 



Denso-sporites lobatus sp. nov. 

 Plate 6, figures 4-5 



Description. — Spores are radial, thought 

 to be trilete and oval to roundly triangular, 

 as viewed in transverse plane. The holo- 

 type (figure 4) measures 37.8 X 44.1 mi- 

 crons and the known size variation is from 

 34 to 55 microns. The proximal and distal 

 portions of the spore coat are actually 

 vermiculate, appearing reticulate when not 

 in perfect focus. The equatorial portion 

 of the spore coat is not a homogeneous 

 opaque structure but rather consists of an 

 essentially opaque area and a definitely 

 translucent area which extends beyond the 

 opaque area to the margin of the spore wall. 

 The peripheral margin of the opaque area 

 of the equatorial portion of the spore coat 

 is sharply lobed to nearly clefted, thus the 

 margin is irregular in outline although the 

 apexes somewhat parallel the outline of the 

 spore coat in transverse plane. The trilete 

 mark has not been definitely observed, 

 probably due to the ornamentation of the 

 proximal and distal portions of the spore 

 coat. However, a faint mark has been ob- 

 served on several specimens which suggests 

 the presence of a trilete mark. The proxi- 



