. The Canadian field-naturalist. 284 The Canadian Field-Naturalist Vol. 105. rf I. Distribution of Isoetes tuckermanii. in North America (adapted from Kott and Britton 1983). Solid circles are new Ontario records. an emergent during low tide and receding water level". This characteristic is interesting as fluctuating water levels have been reported as one mechanism that enables coastal plain species to persist in Ontario (Keddy and Reznicek 1982; Sharp and Keddy 1985). Isoetes tuckermanii has been reported growing in sand, gravel, mud, or even peat. Isoetes tuckermanii should be adde
. The Canadian field-naturalist. 284 The Canadian Field-Naturalist Vol. 105. rf I. Distribution of Isoetes tuckermanii. in North America (adapted from Kott and Britton 1983). Solid circles are new Ontario records. an emergent during low tide and receding water level". This characteristic is interesting as fluctuating water levels have been reported as one mechanism that enables coastal plain species to persist in Ontario (Keddy and Reznicek 1982; Sharp and Keddy 1985). Isoetes tuckermanii has been reported growing in sand, gravel, mud, or even peat. Isoetes tuckermanii should be added to the growing list of rare coastal plain disjuncts which occur in the Georgian Bay area (Keddy 1981). Other coastal plain species such as Panic Grass (I)i( anthelium sprelum). Rigid Panic Grass {Panicum rigidulum), Waterwort (Elatine min- ima). Virginia Meadow-beauty ( Rhexia virginica), and Yellow-eyed Gi ass f A i ris diffbrmis), occurred at Wahwashkesh Lake, which ranked third of 49 lakes assessed for possible protection of coastal plain species (C. J. Keddy, and ll>si>. Atlantic Coastal Plain Flora Conservation in Ontario. Unpublished report lor the World Wildhle Fund and Natural Heritage League.) Although undoubted!) rare in Ontario, /. tuckermanii is likely overlooked, li should be sought in othei lakes supporting coastal plain species. Voucher Material Cited All specimens ol the authors1 will eventually be deposited in OAC excepting duplicates as noted below. hybrid: Sharp 617, Graves Bay. Wahwashkesh Lake. Sand beach with gravelly peat sections, many stranded on beach. 6 August 1982. This specimen died while in a growth chamber and the remains were discarded. Initial work indicated it was 2n > 44. and, in view of its extremely robust stature, was probably a hybrid /. macrospora x tuckermanii. Isoetes tuckermanii: Dickson and Brownell 1153, (CAN 437264), North shore of Magnetewan River, Magnetewan Park Reserve. In shallow water. 26 July 1977. Britt
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