MIDDLE DEVONIAN COAL IN ILLINOIS 17 



Description. — The spore is radial, trilete, and subcircular in outline. The 

 straight laesurae possess lips about 2 \± wide and extend about three -fourths the 

 length of the radius. A patinate layer of uniform thickness covers the distal side 

 and extends onto the proximal side about one-half the distance to the proximal 

 pole. The proximal edge of the patina ends abruptly. The exine is infra -punctate. 

 The diameter is 54.6 by 48.8 \±. 



Genus RHABDOSPORITES Richardson, 1960 

 Type species. — R. langi (Eisenack) Richardson, 1960. 



Rhabdosporites langi (Eisenack) Richardson, 1960 

 Plate 5, figure 6 



Genus ANCYROSPORA Richardson, 1960 

 Type species. — A. grandispinosa Richardson, 1960. 



Ancyrospora sp. 

 Plate 5, figure 7 



Description. — The spore is radial, trilete, and possesses a bladder. The 

 subcircular central body possesses straight rays that extend about three -fourths 

 the distance to its periphery. The bladder bears numerous appendages that taper 

 from a wide base to a narrow constriction and then abruptly expand just below the 

 bifurcated ends. The appendages are 10 to 16 \i long and 3 to 5 (jl wide at their 

 bases. The spore is at least 130 n in over-all dimension and has a central body 

 of 71 fi. 



Discussion. — This spore and one fragment of another were the only speci- 

 mens observed that display grapnel-shaped appendages. The fragmented specimen 

 appeared to be thicker walled and may represent the genus Hystrichosporites McGreg 

 or, 1960. 



Genus RETIALETES Staplin, 1960 

 Type species. — R. radforthii Staplin, 1960. 



Retialetes sp. 

 Plate 5, figure 8 



Discussion. — This species is probably the same taxon described and desig 

 nated as Retialetes sp. by Allen (1965, p. 741, pi. 106, figs. 3 and 4). 



