Homalosorus

Glade fern
Homalosorus pycnocarpos in mesophytic forest, Brown County State Park, Indiana, USA.

Secure  (NatureServe)
Scientific classification
Kingdom: Plantae
Clade: Tracheophytes
Division: Polypodiophyta
Class: Polypodiopsida
Order: Polypodiales
Suborder: Aspleniineae
Family: Diplaziopsidaceae
Genus: Homalosorus
Small ex Pic.Serm.
Species:
H. pycnocarpos
Binomial name
Homalosorus pycnocarpos
(Spreng.) Pic.Serm.
Synonyms
  • Asplenium angustifolium Michx., illegitimate, non Asplenium angustifolium Jacq.
  • Athyrium angustifolium Milde, replacement name for Asplenium angustifolium Michx.
  • Diplazium angustifolium (Milde) Butters
  • Asplenium pycnocarpon Spreng.
  • Athyrium pycnocarpon (Spreng.) Tidestr.
  • Diplaziopsis pycnocarpa (Spreng.) M.G.Price
  • Diplazium pycnocarpon (Spreng.) M.Broun

Homalosorus is a genus of fern with only one species, Homalosorus pycnocarpos. It may also be referred to by its older synonyms Athyrium pycnocarpon and Diplazium pycnocarpon. Commonly referred to as the narrow-leaved glade fern, narrow-leaved-spleenwort, or glade fern, it is endemic to eastern North America and typically grows in moist woodlands. Once classified in the family Athyriaceae due to its linear, often doubled sori, in the Pteridophyte Phylogeny Group classification of 2016 (PPG I), it is placed in the small family Diplaziopsidaceae, whose other three species are native to east Asia. Other sources place the genus in the subfamily Diplaziopsidoideae of a very broadly defined family Aspleniaceae, equivalent to the suborder Aspleniineae in PPG I.

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