Huperzia porophila (F. E. Lloyd & Underw.) Holub is known from nearby areas on the north shore of Lake Superior and in Wisconsin and may be found in Michigan one day. It resembles a compact small H. lucidula and grows exclusively on rock, mostly shaded sandstone. Aside from habitat and size, it can be distinguished from H. lucidula by the lanceolate leaves and presence of stomata on the upper surface of the leaves. It is thought to be a fertile polyploid derived from the hybrid of H. appressa and H. lucidula, and can be best distinguished from the primary hybrid (which is also not known from Michigan) by its non-abortive spores.
1. Longer vegetative leaves 7.5–12 mm long, narrowly obovate, clearly widest above the middle, spreading to ± reflexed, the apical portion of at least the larger leaves with distinct teeth; shoots “shaggy” with conspicuous annual constrictions.
1. Longer vegetative leaves 3.5–7.5 mm long, lanceolate, widest below the middle, leaves (at least those on the upper portion of the stem) often ascending, entire or with a few obscure, small teeth; shoots with annual constrictions lacking or obscure.
2. Leaves near the base of the plant essentially the same size as those on the upper portion; gemmae formed in a single whorl at end of the annual growth; widespread in the northernmost Lower Peninsula and Upper Peninsula.
2.Leaves near the base of the plant conspicuously longer than those on the upper portion; gemmae formed throughout the upper portions of the shoot; apparently Isle Royale only.
All species found in Huperzia
MICHIGAN FLORA ONLINE. A. A. Reznicek, E. G. Voss, & B. S. Walters. February 2011. University of Michigan. Web. August 18, 2017. http://michiganflora.net/genus.aspx?id=Huperzia.