G. Erdtman

SPORODERM MORPHOLOGY AND MORPHOGENESIS. A COLLOCATION OF DATA AND SUPPOSITIONSG. ERDTMANMorphologically defined layersMorphologically defined layers and zones as seen by means of ordinary light microscopy in unsectioned, unstained microspores or pollen grains, are as follows (schemes only; the...

geol. foren. forhandl. bd 83 h. 1 1961 6S Cormophyte Spore Classification An Outline Based on the Apertures (Tremata) By G. Erdtman and H. Straka Systems for spore classification are generally based on several spore characters. The "NPC-system" outlined below, is based on one feature only,...