. Contributions from the Osborn Botanical Laboratory. Plants. Vegetation of Northern Cape Breton. 401 of hills (Figs. 51, 52), and in general prevails en well-drained uplands wherever the conditions of exposure are such as to pre- vent the development of a more mesophytic type of vegetation. At first sight an area occupied by this association-type appears as a crowded, labyrinthine series of low mounds or hummocks, irregular in size and shape, but averaging perhaps from three to ten feet in diameter by from one to two feet in height. The hummocks are densely overgrown with cladonias and suppor
. Contributions from the Osborn Botanical Laboratory. Plants. Vegetation of Northern Cape Breton. 401 of hills (Figs. 51, 52), and in general prevails en well-drained uplands wherever the conditions of exposure are such as to pre- vent the development of a more mesophytic type of vegetation. At first sight an area occupied by this association-type appears as a crowded, labyrinthine series of low mounds or hummocks, irregular in size and shape, but averaging perhaps from three to ten feet in diameter by from one to two feet in height. The hummocks are densely overgrown with cladonias and support a thick growth of low shrubs, mostly ericads. Depressed, bushy trees, mainly black spruce, scarcely two feet high but spreading. Figure 52.—Dwarf shrub-spruce heath ; barrens in mountains west of Ingonish. out laterally over a radius of several feet, constitute an important element in the vegetation, growing on or alongside the hum- mocks. Here and there, scattered tamaracks may be conspicu- ous by reason of the fact that they project somewhat above the general surface level of the surrounding vegetation, which otherwise maintains a nearly uniform height at from two to two and a half feet above the floor of the depressions which separate the hummocks. In typical dwarf shrub-spruce heath, the depressions between the hummocks are open and, aside from the cladonia mat which nearly everywhere covers the ground, their vegetation is scanty. The following list includes the more characteristic plants of dwarf shrub-spruce heath:. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Osborn Botanical Laboratory. [New Haven?] Osborn Botanical Laboratory, Yale University
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