Isoetes lacustris

Isoetes lacustris (lake quillwort or Merlin's grass) is a boreal quillwort native on both sides of the northern Atlantic Ocean. In Europe, it is distributed from Poland west to northeastern France, throughout Scandinavia, the west and north of the British Isles, the Faroe Islands and Iceland. In the North America, it occurs in the New England states of Maine, Vermont, New Hampshire Rhode Island and Massachusetts, and in Canada in provinces of New Brunswick and Nova Scotia. It was discovered by Johannes Reinke. The lake quillwort has many long, narrow leaves from 8–20 cm long and 0.5–2 mm broad, widening to 5 mm broad at the base. There is a sac that produces the spores at the bottom of each leaf base. The plant has a very short stem, called a corm, where all the leaves and roots are attached close together. It does not have traditional roots, but instead some of its leaves are modified to act like roots. These pseudo-roots are called rhizomorphs, and are attached to the bottom end of corm. The upper leaves are green and found sprouting in a clump. It is found on the stony or sandy bottoms of clear, usually slightly acidic ponds, typically in mountain tarns, growing at 5–460 cm depth of water. They are perennial, with typically two flushes of new leaves each year, in spring and autumn.