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Two new species of Alsophila and four of Cyathea (Cyatheaceae) are described and illustrated: Cyathea zongoensis, C. arnecornelii and C. carolihenrici from Bolivia; Alsophila minervae and A. mostellaria from Peru and Bolivia; Cyathea xenoxyla from southern Colombia to central Bolivia.
Isoëtes tennesseensis, an octoploid species with a chromosome count of 2n = 88, is described. It occurs in the Hiwassee River in Tennessee. Past collections of this species have been misidentified as Isoëtes macrospora (= I. lacustris). Isoëtes tennesseensis differs from I. lacustris in chromosome number, megaspore and microspore morphology and distribution. Speculation on the origin of this new species is presented.
A new species of Asplenium is described from the middle and high altitude mountains of northern Luzon, Philippines. This new species, Asplenium ofeliae, is related to A. unilaterale Lam. and is endemic to the Philippines.
Lycopodiella ×gilmanii is described as a new hybrid from northeastern North America. It is the result of L. appressa × L. inundata as inferred from morphology and geography. A key is provided for Lycopodiella in northeastern North America that includes hybrids.
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