Abstract
To determine the responses of cryptogams to the variations in temperature, pH, and humidity, we studied the vegetation of Thermal Meadow, Hotsprings Island, Queen Charlotte Islands, B.C., Canada. Only seven cryptogamic taxa were present in the samples: five mosses, one liverwort, and one lichen. Humidity limited the distribution, with Racomitrium lanuginosum and Cladina ciliata preferring the warmer, drier sites and Pleurozium schreberi and Dicranum scoparium preferring cooler, more moist sites. Polytrichum formosum was the most frequent taxon, occurring under both cool, moist conditions and warm, dry conditions. Aulacomnium palustre occurred in the mid temperature range mostly where humidity was fairly high. The pH ranged 6.8–7.2, providing insufficient variation for us to delimit species preferences.
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