Abstract
A quantitative analysis of gametophyte characters of Tomenthypnum falcifolium (Ren. ex Nichols) Tuomikoski in Ahti and Fagerstin and T. nitens (Hedw.) Loeske shows significant differences in certain measurements of leaf length and leaf shape. These differences are still present in mixed collections of the two species. Tomenthypnum falcifolium appears to be endemic to the boreal and sub-arctic zones of North America. Quantitative ecological analyses, along with field observations, in westcentral Canada show that Tomenthypnum falcifolium occurs in weakly minerotrophic areas (poor fens) forming hummocks with Sphagnum angustifolium (Russ.) C. Jens. and S. magellanicum Brid., while T. nitens occurs in minerotrophic to strongly minerotrophic areas (rich fens) forming lawns and small hummocks often in association with Sphagnum warnstorfii Russ. and other 'brown
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