Discussion:Key to the Varieties of Fissidens guianensis1. Limbidium not extending more than 2/3 the length of the vaginant laminae, usually much less var. guianensis (p. 141).1. Limbidium extending the entire length or nearly so of the vaginant laminae and often a short distance onto the adjoining ventral lamina var. pacaas-novosensis (p. 143).