402 



PAST succession: the ceneosere. 



Species. 



Festuca ovina 



Gaylussacia resinosa . . . . 



Gramineae sp 



Hypnum commutatum . . 



" fluitans 



" revolvens 



sp 



Junipenis virgiiiiana . . . . 



Larix americana 



Lycopodium sp 



Maclura aurantiaca 



Oryzopsis asperifolia 



Oxycoccus palustris 



Ficea alba 



" nigra 



" sp 



Pinus strobus 



Platanus occidentalis 



Populus balsamif era . . . . 



" grandidentata . . 

 Fotamogeton pectinatus . 

 " perfoUatus 



" pusillus. . . 



" rutilans. . . 



" natans. . . . 



Potentilla anserina 



Prunus sp 



Quercus obtusiloba 



alba (?) 



" rubra 



" tinctoria 



" oblongif olla . . . . 



" macrocarpa . . . , 



" aciuninate. ... 

 Robinia pseudacacia ... 



Salix sp 



Taxus canadensis 



Thuya occidentalis .... 



Tilia americana 



Typha latifolia 



Ulmus americana 



racemosa 



Vaccinium uliginosum . . 



Vallisneria spiralis 



Zostera marina 



Totals 



Bartlett (1909) has described a white cedar (Chamaecyparis) bog at Wood's 

 Hole. This bog is covered on the seaward face by salt-marsh vegetation and 

 deposits, while landward it is a typical cedar swamp. The author concludes 

 that it is evidence of former coastal subsidence. 



Berry (1909) has summarized the discoveries of late Pleistocene peat deposits 

 along the rivers of Virginia: 



These usually contain cypress stumps, together with seeds of Nyssa, Vitis, 

 Fagtis, and Taxodium. While most of the Pleistocene peat indicates cypress 



