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There are hundreds of exospore units that extend across the gap and into the mesospore in middle stages in megaspores of Selaginella pulcherrima Liebm.ex Fourn and S. haematodes (Kunze) Spring. The mesospore of these megaspores is resistant to acetolysis during middle stages suggesting the presence of sporopollenin. There are also spheroidal structures that are resistant to acetolysis on the surfaces of the outer and inner exospore in both species in middle and mature stages. In late stages thefatcat:gbmtmddfrnebfbvxgdbk6njenq