Text-fig. 2. Spores of Phialopteris heterophylla (SEM). a) group of spores from one sporangium, b) trilete spore showing general morphology, and c) detail of (b) showing smooth endospore and faintly granulate perispore remains (arrowheads). Scale bar: a) 50 μm, b) 20 μm, c) 10 μm. in Phialopteris Heterophylla (Sternberg Ex Göppert, 1836) Comb. Nov., A Rare Schizaeaceous Fern From The Early Jurassic Of Bavaria - Cittert, Johanna H. A. Van Konijnenburg-Van (2018)