The rhizospheres of several species examined at multiple sites were NA positive regardless of habitat: Carex lacustris, Chamaedaphne calyculata, Typha angustifolia, and Vaccinium macracarpon (Table 1).
Nitrogenase Activity (a) per [m.sup.2] Site Plant species n per g root (x[10.sup.2]) Fern Lake Bog Chamaedaphne 3 59.0 205.5 calyculata Spbagnum spp.
X X Dulichium arundinaceum Fuirena pumila Ceratophyllum demersum X Nuphar advena X X Nymphaea odorata X Brasenia schreberi X Sarracenia purpurea Impatiens capensis Myriophyllum exalbescens X Andromeda glaucophylla Chamaedaphne
calyculata Vaccinium macrocarpon Menyanthes trifoliata Bidens sp.
These include cottongrass (Eriophorum virginicum), leatherleaf (Chamaedaphne
calyculata), pitcher plant (Sarracenia purpurea), sundew (Drosera rotundifolia), pink lady slipper orchid (Cypripedium acaule), and of course, tamaracks (Larix laricina) (Larsen 1982).
However, based on stratigraphy and radiocarbon dating, leatherleaf (Chamaedaphne
calyculata) dominated peatlands made the transition from lake to peatland between 2250-5550 [C.sup.14] ybp earlier than other types of peatlands, both Sphagnum-dominated and non-Sphagnum-dominated (Fig.
The presence of subfossils of Sarracenia purpurea, Chamaedaphne calyculata and Vaccinium corymbosum indicate an acidic leatherleaf bog much like that of the extant community.
magellanicum, Chamaedaphne calyculata, Scirpus cyperinus, Rubus hispidus, Vaccinium corymbosum, Aronia melanocarpa and Cephalanthus occidentalis.
bartlettianum, Chamaedaphne calyculata, Carex oligosperma and Woodwardia virginica.
Characteristic plants included Andromeda glaucophylla, Betula pumila, Carex oligosperma, Carex trisperma, Chamaedaphne calyculata, Coptis trifolia, Drosera spp., Larix laricina, Menyanthes trifoliata, Potentilla fruticosa, Sarracenia purpurea, Sphagnum spp., Vaccinium macrocarpon, and V.
Extremely mineral-rich fens in Indiana are characterized by a dense, low growth of Potentilla fruticosa, the fen counterpart of Chamaedaphne calyculata.
These sites had a well-developed shrub layer of either Vaccinium corymbosum or Chamaedaphne calyculata and a ground layer of Sphagnum moss.
The wet site had three taxa (Chamaedaphne calyculata, Vaccinium corymbosum and Sphagnum spp.) that were unique to the site and a high percentage of Kalmia angustifolia (Table 2).