Note on the Sizes of Largest Thalli of Three Species of Rhizocarpon (Subgenus rhizocarpon) at a Rockslide in the Canadian Rocky Mountains

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Abstract
The largest thallus sizes of three species of Rhizocarpon (subgenus Rhizocarpon) [R. geographicum, R. superficiale, and R. eupetraeoides] growing at a single site are significantly different. In addition, each species appears to respond differently to local changes in microclimate. Jonas Rockslide, Alberta, Canada, is estimated to be at least 500 yr old, rather than the 100 yr old suggested by other researchers.