CONTENTS 



Page 



Introduction 10 



Previous investigations 11 



Preparation techniques 12 



Coal 12 



Limestone, siltstone, shale, and clay 12 



Location of specimens on slides 13 



Description of small spores 13 



Genus Ahrensisporites 13 



Genus Alatisporites 14 



Genus Cadiospora 14 



Genus Calamospora 14 



Genus Cirratriradites 15 



Genus Columinisporites 15 



Genus Convolutispora 16 



Genus Crassispora 17 



Genus Cyclogranisporites 18 



Genus Densosporites 18 



Genus Dictyotriletes 19 



Genus Endosporites 19 



Genus Florinites 19 



Genus Granulatisporites 19 



Genus Gravisporites 22 



Genus Hamiapollenites? 22 



Genus Illinites 23 



Genus Indospora 23 



Genus Knoxisporites 24 



Genus Laevigatosporites 24 



Genus Latipulvinites 25 



Genus Limitisporites 26 



Genus Lueckisporites 26 



Genus Lundbladispora 26 



Genus Lycospora 27 



Genus Microreticulatisporites 28 



Genus Pityosporites 28 



Genus Potonieisporites 28 



Genus Punctatisporites 29 



Genus Raistrickia 36 



Genus Reinschospora 37 



Genus Reticulatisporites 37 



Genus Rhizomaspora 38 



Genus Savitrisporites? 38 



Genus Secarisporites 38 



Genus Striatosporites 39 



Genus Strotersporites 39 



Genus Triquitrites 39 



Genus Trivolites 41 



Genus Vesicaspora 42 



