. Bulletin. Biology -- Ohio; Plants -- Ohio. BOTANICAL SURVEY—SUGAE GEOVE EEGION 277 action of the wind and to the greatest extremes of temperature, together with the most sudden changes which are possible within the limits set up by the climate of the region. The flora is of the sort that has gen- erally passed as xerophytic, but in reality it may not be so much xero- phytic as oxyphytic. It bears little resemblance to the truly xerophytie flora of desert regions. '-^f. ^j^^. Fig. 16. The Miniature Tundra at the Edge of the Pine Forest. The vegetation of the cliff tops develops into zones sim
. Bulletin. Biology -- Ohio; Plants -- Ohio. BOTANICAL SURVEY—SUGAE GEOVE EEGION 277 action of the wind and to the greatest extremes of temperature, together with the most sudden changes which are possible within the limits set up by the climate of the region. The flora is of the sort that has gen- erally passed as xerophytic, but in reality it may not be so much xero- phytic as oxyphytic. It bears little resemblance to the truly xerophytie flora of desert regions. '-^f. ^j^^. Fig. 16. The Miniature Tundra at the Edge of the Pine Forest. The vegetation of the cliff tops develops into zones similar to those found around ponds, but in this case the zones depend on the depth of the soil and the exposure. The front rock is nearly bare, but supports a few foliose lichens {Parmelia sp.), a few small mosses seldom found in fruit, with occasional stunted stragglers from the next zones. The outermost zone of vegetation is the lichen formation. It ex- tends from the bare rock back until the soil has reached a deptli of about a decimeter, when it gives way to the Vaccinium zone. The characteristic plants are: Cladonia spp. Polytricum Lechea 'mi7ior Panicum sphaerocarpon Carex (two or three species, in- cluding C. triceps.) Hou/ttonia longifoUa There are also numerous waifs fi-om other associations. On this account the composition of the zone varies greatly from place to place. 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 Ohio Biological Survey. Columbus, Ohio : Ohio State University
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