Pseudocyclosorus johannae

• Interesting Facts
• Description
• Taxonomy
• Similar Species
• More Info
• Further Reading
• Notes

Interesting Facts

Description

Family Thelypteridaceae

Plants terrestrial or on rock [epiphytic]. Stems creeping to erect , scaly at apex. Leaves monomorphic or somewhat dimorphic [dimorphic]. Petiole in cross section with 2 crescent-shaped vascular bundles at base . Blade pinnate to pinnate-pinnatifid, rarely more than 2-pinnate [simple ]; rachis grooved adaxially or not, grooves not continuous with grooves of next order . Veins free or anastomosing, running to margin , areoles with or without included free veinlets. Indument of transparent, needlelike, hooked , septate , or stellate hairs , or rarely hairs lacking. Sori inframedial to supramedial, occasionally nearly marginal , round or oblong , rarely elongate along veins; indusia reniform or sometimes absent. Spores bilateral , monolete [rarely globose-tetrahedral and trilete], usually with a prominent , crested , echinate , or reticulate perispore . Gametophytes green, cordate, usually hairy or glandular ; antheridia 3-celled.

Genera 1 to ca. 30, depending on circumscription, species ca. 900 (as circumscribed here, 3 genera and 25 species in the flora ) : mostly tropical .

Members of Thelypteridaceae have historically been associated with Dryopteridaceae (in particular, Dryopteris ) but in fact have no close relationship with that family . Thelypteris and allies differ from Dryopteris and allies by their indument of transparent needlelike hairs (versus needlelike hairs absent in Dryopteridaceae) ; general absence of blade scales (versus blade scales often present) ; petiole vasculature in cross section with two crescent-shaped bundles (versus many round bundles arranged in an arc, Athyrium and allies exceptional) ; generally 1-pinnate to pinnate-pinnatifid blades (versus often more divided ) ; veins usually not forking in the ultimate segments (versus often forking) ; adaxial grooves discontinuous from rachis to costae, or grooves lacking (versus grooves often continuous) ; and chromosome base numbers from 27--36 (versus generally 40, 41) .[1]

Taxonomy

Notes

Publishing author : Holttum Publication : J. S. African Bot. 40: 138. 1974. 1974

Similar Species

Members of the genus Pseudocyclosorus

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More Info

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Further Reading

Notes

Contributors

• Brands, S.J. (comp.) 1989-present. The Taxonomicon. Universal Taxonomic Services, Zwaag, The Netherlands. Accessed January 30, 2012.

Identifiers

• Biodiversity Heritage Library NamebankID: 8853208
• Global Biodiversity Information Facility Taxonkey: 15878907
• Globally Unique Identifier: urn:lsid:ipni.org:names:17452190-1
• International Plant Names Index (IPNI) ID: 17452190
• Zipcode Zoo Species Identifier: 1414309

Footnotes

1. Alan R. Smith "Thelypteridaceae". in Flora of North America Vol. 2. Oxford University Press. Online at EFloras.org. [back]

©2004-2012 David Stang. All rights reserved.