Sporangium of the Ophioglossales ......
from $18.08
Ophioglossales-Filicales : Ophioglossaceae, Marattiaceae, Osmundaceae, Ceratopteridaceae, Schizaeaceae, Gleicheniaceae, Cyatheaceae (pars). 1909. North American Flora vol. 16, pt. 1.
from $15.00
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