ANNALS CARNEGIE MUSEUM, Vol. V. 



Plate XXIII. 



A SCHEMATIC CLASSIFICATION OF THE VEGETATIONAL FORMATIONS OF PRESQUE ISLE. 



A. — Beach Stage. 



L The Beach — Sand Plain— Heath — Forest Succession. 

 B. — Sand Plain Stage. C. — Heath Stage. D. — Pine Forest Stage. 



E. — Oak Forest Stage. 



-| f\t Y fL- p f- \ Artetnisia-Panicum Formation Arctostaphylos-Juniperus Formation... Ptnus S^rodus Formation Quercus veluiina Formation. 



A. — Beach Stage. 



* ^ ^ 



/ Chlamydomonas Formation 1 

 \ Cakile-Xanthium Formation / ' 



H. The Beach — Sand Plain — Thicket — Forest Succession. 

 B. — Sand Plain Stage. C. — Thicket Stage. D. — Cherry Forest Stage. 



E. — Oak Forest Stage. 



irtemisia-Panicum Formation Myrica Thicket Formation Prunus serotina Formation Quercus velutina Formation. 



III. The Dune — Thicket — Forest Succession. 

 A. — Dune or Ridge Stage. B. — Thicket or Heath Stage. C. — Cherry or Pine Forest Stage. 



I. — Populus Dune or Ridge '^ r — ^ ^ i * \ 



2. — Amtnophila Dune I either Toxicodendi-on Formation Prunus serotinn Formation ") 



3. — Andropogon Dune ["or Arctostaphylos-Juniperus Pinus Strobus Formation / 



4. — Prunus pumila Dune J 



D. — Oak Forest Stage. 



. Quercus velutina Formation. 



IV. 



Stage A. 



Stage B. 



The Lagoon — Marsh — Thicket — Forest Succession. 



Stage C. Stage D. 



Stage £. 



Potamogeton Formation Potamogeton Formation 



.Potamogeton Formation Potamogeton Formation 



Populus-Salix Formation 



Stage F. 



[Potamogeton Formation) 

 [Nymphaa Formation) 



Scirpus- Typha Formation 

 Cladium-Calamagrostis Form.! 



, Rhus-Alnus Formation * 

 . Populus-Salix Formation 



Potamogeton Formation. 



Nymphcza Formation. 



Scirpus- Typha Formation Scirpus-Typha Formation. 



Juncus-Eleockaris Formation Scirpus-Typka Formation Sabbatia- Linum Formation Cladium-Calamagrostis Formation. 



Sabbatia- Linum Formation Myrica-Salix Formation Mynca-Salix Formation. 



.Populus-Salix Formation Populus-Salix Formation Populus-Salix Formation Populus-Salix Formation. 



Stage G. 



Stage H. 



Stage I. 



Potamogeton Formation 

 Nymphcea Formation 



. Scirpus-Typha Formation 

 , Cladium- Calamagrostis Formation 

 \Fragaria- Poly trie hum Formation] 

 . Rhus-Alnus Formation 

 . Prunus-Acer Formation 



. Potamogeton Formation Potamogeton Formation. 



,. Castalia-Nymphiza Formation Castalia-Nymphma Formation. 



Decodon-Persicaria Formation. 



. Cephalanthus-Cornus Formation Cephalanthus-Corfius Formation. 



[Sphagnum- Oxycoccus Formation] 

 \_Aronia-Polytrichum Formation] 



Rhus-Abius Formation Rhus-Alnus Formation. 



. Prunus-Acer Formation Ulmtts-Acer Formation. 



I. The Marsh Habitat. 

 Stage A. 



Scirpus Formation 



Salix discolor-lucida Formation 



Solidago Meibomia Formation 



V, The Bay — Marsh— Thicket — Forest Successions. 

 2. The Cove Habitat. 



Stage B. 



' Scirpus Formation 

 Phragmites- Typha Formation 

 Cladium- Calamagrostis Form. 

 Rhus-Alnus Formation 



. Ulmus-Acer Formation 



Chara Formation 

 Potamogeton Formation 

 Castalia-Ny7npht2a Formation 

 Phragmites- Typha Formation 

 Rhus-Alnus Formation 

 Ulmus-Acer Formation 



3. The Driftwood Habitat. 



A . 



{Potamogeton Formation. 

 Scirpus-Typha Formation. 

 Sagittaria-Alisma Formation. 

 Salix discolor-lucida Formation, 

 (or Cladiutn-Calaviagrostis Formation.) 



