spiny-spored quillwort

Isoetes echinospora is a species of lycophyte in the family Isoetaceae. It is sometimes referred to by the common names spiny quillwort, spiny-spored quillwort or spring quillwort

It is an abundant species in Canada. It can be found in shallow aquatic environments from Labrador and Newfoundland to Alaska, and south to Pennsylvania, Wisconsin, Michigan, Colorado, and California. In Germany it is found in only two locations: the Feldsee and Lake Titisee, both in the High Black Forest.