''Isoetes echinospora'', also known as spiny quillwort, spiny-spored quillwort or spring quillwort is a species of quillwort in the Isoetaceae family, and is the most abundant species in Canada. It can be found in shallow aquatic environments from Labrador and Newfoundland to Alaska, and south to Pennsylvania, Wisconsin, Colorado, and California. In Germany it is found in only two locations: the

Feldsee The Feldsee (also ''Feldbergsee'') is a lake in southern Baden-Württemberg at the foot of the Feldberg east of Freiburg im Breisgau in Germany. It is part of the Southern Black Forest Nature Park. Geology and earth history The Feldsee ...

and Lake Titisee, both in the High Black Forest.Information Board at the Feldsee. Recorded on 26 Aug 2015. It bears 10–30 green to yellow leaves and a two-lobed corm. The velum covers one to three quarters of the

sporangium A sporangium (; from Late Latin, ) is an enclosure in which spores are formed. It can be composed of a single cell or can be multicellular. Virtually all plants, fungi, and many other lineages form sporangia at some point in their life cy ...

, which are long. Round white megaspores are about in diameter and are covered with spines. Kidney-shaped microspores are about long with smooth, fine spines. European populations of the plant lack the stomata present in North American populations. ''Isoetes muricata'' and ''Isoetes echinospora'' var. ''braunii'' refer to the North American plants, but are often considered synonyms of Europe's ''I. exhinospora''.

References

echinospora Flora of North America Flora of Germany {{Lycophyte-stub