Critically Imperiled (NatureServe)
(Hillebr.) Kartesz & Gandhi
Huperzia mannii is a species of lycopod plant known by the common names Mann's clubmoss and wawae`iole. It is endemic to Hawaii, where there are only six populations remaining. It is a federally listed endangered species of the United States.
This plant is an epiphyte which grows upon other plants, especially koa (Acacia koa), 'olapa (Cheirodendron trigynum), and kawa'u (Ilex anomala). It has a hanging, branching, reddish stem no more than 10 centimetres (3.9 in) long. Each branch has three longitudinal rows of toothlike leaves. When reproducing the plant produces a branching fruiting spike which may be up to 20 centimetres (7.9 in) long.
Today the plant is known from just a few occurrences on the islands of Maui and Hawaii. It is historically known from Kauai, but it may be extirpated there. Threats to its existence include damage to the habitat by feral pigs, cattle, and introduced plant species, and the fact that there are few individuals remaining.
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