Plagiogyria

Plagiogyria tuberculata

Plagiogyria is a genus of tree ferns ( Cyatheales ). It is the only genus of the family Plagiogyriaceae.

Features

The Stems are creeping up usually upright. Hairs or scales missing. The leaves are dimorphic, sterile and fertile parts are different. The leaf blades are comb-shaped ( pectinate ) pinnate to easy. The nerves are simply forked up once, they end free or anastomose in fertile leaf blades at its end. Young leaves are densely covered with multicellular glandular, mucus hair.

The sori have no indusia. The sporangia are on the distal areas of the nerve. The sporangia stalks are six rows, the annulus is slightly opaque and continuous. The spores are tetrahedral and trilet ( three-piece scar ).

The gametophyte is green and heart-shaped.

The basic chromosome number is x = 66?

System

The genus is closely related to the Culcitaceae. It consists of about 15 species, including

• Plagiogyria euphlebia ( Kunze ) Mett. ( Type species )
• Plagiogyria semicordata (C. Presl ) H. Christ

Documents

• Alan R. Smith, Kathleen M. Pryer, Eric Schuettpelz, Petra coral, Harald Schneider, Paul G. Wolf: A classification for extant ferns. In: taxon. Volume 55, No. 3, 2006, ISSN 0040-0262, pp. 705-731, Abstract, PDF file.

Further Reading

• X.-C. Zhang, H. P. Nooteboom: A taxonomic revision of Plagiogyriaceae. In: Blumea. Volume 43, No. 2, 1998, pp. 401-469, Abstract.