RRichard Eric Holttum, Distinguished PteridologistRichard Eric Holttum, Distinguished Pteridologistde Warren H. WagnerEdiciones (1)Richard Eric Holttum, Distinguished Pteridologist (1969)inglésMás obras de Warren H. WagnerFFerns naturalized in HawaiiFerns naturalized in HawaiiTThe endemic Botrychiums of the Southeastern United StatesThe endemic Botrychiums of the Southeastern United StatesDDryopteris in the Huron mountain club area of MichiganDryopteris in the Huron mountain club area of Michigan
TThe endemic Botrychiums of the Southeastern United StatesThe endemic Botrychiums of the Southeastern United States
DDryopteris in the Huron mountain club area of MichiganDryopteris in the Huron mountain club area of Michigan
AAmerican Grapeferns resembling Botrychium ternatumAmerican Grapeferns resembling Botrychium ternatum
TThe log fern (Dryopteris celsa) and its hybrids in MichiganThe log fern (Dryopteris celsa) and its hybrids in Michigan