

208 



BOTANICAL GAZETTE 



[march 



origin for this wood is furnished by a uniseriate ray in tangential section and 

 an absence of vessels; indications for a sedimentary origin for this stratum are 

 manifest as a sponge spicule, abietineous pollen, and a group of spores in upper 

 right hand corner. 



Fig. 12. — A bituminous coal from Perry County, Ohio, X250; crinkled 

 bands of compressed wood are especially obvious in upper and left hand parts; 

 evidences of an allocthonous origin for this coal occur as flattened spores, 

 appearing as light bodies imbedded in a dense black amorphous matrix. 



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