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The vertical zonation of Sphagnum species in hummock-hollow complexes in northen Michigan. Michigan Botanist. 14:190-200.. 1975.
Sex determination in mosses. Michigan Botanist. 7:195-203.. 1968.
The infrageneric evolution, phylogeny, and taxonomy of the genus Orthotrichum (Musci) in North America. Nova Hedwigia. 21:683-711.. 1971.
An analysis of the vegetation of Sphagnum-dominated kettle-hole bogs in relation to environmental gradients. Canadian Journal of Botany. 53:332-259.. 1975.
A revision of the genus Orthotrichum in North America, north of Mexico. Bryophytorum Bibliotheca. 1:208.. 1973.