Natural Communities of NH -- Photo Guide


Circumneutral - calcareous flark  (S1)



Circumneutral - calcareous flark
is a very rare community in New Hampshire and New England, and is known from a single patterned fen system in the northern part of the state. This fen has saturated, linear hollow areas (flarks) and intervening low peat ridges (strings) arranged perpendicular to the direction of groundwater flow. Fens with this type of string and flark patterning are more common in northern Maine and adjacent Canada, but few are calcareous.

Characteristic Vegetation:
This is a soupy, semi-aquatic environment with an abundance of brown algae and a sparse cover of vascular plants such as buckbean (Menyanthes trifoliata), bog rosemary (Andromeda glaucophylla), small bladderwort (Utricularia minor), pitcherplant (Sarracenia purpurea), white beak-rush (Rhynchospora alba), and spatulate-leaved sundew (Drosera rotundifolia). Several rare rushes and sedges restricted to calcium-rich conditions may be present, including moor rush (Juncus stygius var. americanus) and livid sedge (Carex livida).  


A good example of this community occurs east of Umbagog Lake (Errol). 

Circumneutral - calcareous flarks occur as part of patterned fen systems.


Circumneutral - calcareous flark (photo by Dan Sperduto for the NH Natural Heritage Bureau)
circumneutral - calcareous flark (wet portion in center) near Umbagog Lake in Errol 
(photo by Dan Sperduto)


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