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Asplenium ×gravesii

Asplenium ×gravesii Maxon (pro sp.)

Graves Spleenwort

Aspleniaceae (Spleenwort Family)

USDA Symbol: ASGR5

Asplenium ×gravesii (Graves spleenwort) #40168

Image Information

Photographer: Cressler, Alan
County: Floyd
State: GA
Location Notes: Mississippian age Pennington sandstone. Rock Mountain.
Accession date: 2014-08-20
Filename: A_C_IMG0522.JPG
Slide Index: 10304976664_d90745b6cd_o.jpg
Restrictions: Unrestricted
Collection: Wildflower Center Digital Library
Original Format: Digital
Orientation: Portrait
Shot: Three sori-bearing fronds. Photographer's note: "My general feeling is the questionable plants are the rare Asplenium ×gravesii, however, it is supposed to be an incidental hybrid not capable of reproduction. My identification is based on a few intermediate characteristics. Asplenium pinnatifidum has a green rachis and mostly green stipe except for the very bottom which is brown. It is an ancestral hybrid between Asplenium rhizophyllum and Asplenium montanum. Asplenium bradleyi has a mostly brown rachis (fading to green near the terminus) and brown stipe. It is an ancestral hybrid between Asplenium platyneuron and Asplenium montanum. These possible Asplenium ×gravesii have intermediate stipe and rachis. Also, the pinna are intermediate between the more dissected pinna of A. bradleyi and the more entire pinna of A. pinnatifidum. The general frond shape is more elongated than A. bradleyi and more like A. pinnatifidum. There were upwards of a dozen plants of the possible hybrid. These three fronds are off three different plants. I've never seen Asplenium ×gravesii before. I would feel better if it were a typical single sterile hybrid. It is possible these are just atypical Asplenium bradleyi. I welcome any input."
Date Taken: 2013-10-15
NPIN Image Id: 40168

Image Verification

This image has been verified.
By: Joseph A. Marcus
Date: 2014-10-22

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Additional resources

USDA: Find Asplenium ×gravesii images in USDA Plants
Google: Search Google Images for Asplenium ×gravesii