American marten may be important seed dispersers; seeds generally pass through the animal intact, and seeds are likely germinable.
2.
The spores usually remain germinable after several years; there were even spores preserved in herbarium specimens which germinated after 75 years.
3.
Controlled reciprocal pollinations between " P . occidentalis " and " P . orientalis " resulted in good yields of germinable seed and true hybrid seedlings.
4.
Crosses of both species, as females, with " P . racemosa " and " P . wrightii " produced extremely low yields of germinable seed, but true hybrids were obtained from all interspecific combinations.
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