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Abstract Detail


Gilman, Arthur [1], Patel, Nikisha [1].

The Nature of the North American tetraploid Beech Fern.

Northern beech fern, Phegopteris connectilis, is known from north-temperate zones in both the New and Old World. Throughout its range, it is represented primarily by triploid, apogamously reproducing individuals, but sexual diploids are known from mountains in central Japan, and apogamous tetraploids have long been known from eastern Canada and adjacent New England. Originally thought to be of hybrid origin, involving the triploid race and the diploid North American P. hexagonoptera, it is now clear that the tetraploid has a different origin. Enzymes, chloroplast markers, and nuclear markers indicate that, while it is of hybrid origin with P. connectilis as one progenitor, P. hexagonoptera is not in its ancestry, nor is the Asian species, P. decursive-pinnata. To date, the second progenitor has not been found. We have explored the morphology of the tetraploid, which is cryptic and, indeed, somewhat resembles the originally postulated hybrid combination (P. connectilis hexagonoptera). The results of our PCA analysis are presented, along with tips for recognition in the field and herbarium, a preliminary range map, and comments on known habitats.

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1 - Gilman and Briggs Environmental, 1 Conti Circle no. 5, Barre, VT, 05641

none specified

Presentation Type: Oral Paper
Session: 32, Pteridology III
Location: 105/Mayo Civic Center
Date: Tuesday, July 24th, 2018
Time: 4:15 PM
Number: 32009
Abstract ID:1009
Candidate for Awards:Edgar T. Wherry award

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