Drepanophycaceae

Superregnum: Eukaryota
Regnum: Plantae
Divisio: Tracheophyta
Divisio: Lycopodiophyta
Classis: Lycopodiopsida
Subclassis: †Asteroxylidae
Ordo: †Drepanophycales

Familia: †Drepanophycaceae
Fossil-genera: †Balkhashiodendron – †Lidasimophyton – †Drepanophycus – †Tastaephyton
Name

†Drepanophycaceae Kräusel & Weyland, Senckenbergiana 30: 147 (1949), nom. cons. prop.
Synonyms

Heterotypic
†Arthrostigmataceae Koidz., Acta Phytotax. Geobot. 8: 208 (1939), nom. rej. prop.
†Kaulangiophytaceae Bierh., Morph. Vasc. Pl. 44 (1971)

References

Doweld, A.B. 2001. Prosyllabus Tracheophytorum. Tentamen systematis plantarum vascularium (Tracheophyta) [Prosyllabus Tracheophytorum. Опыт системы сосудистых растений]. LXXX + 110 pp. Moscow: Geos. ISBN 5-89118-283-1. Фундаментальная электронная библиотека «Флора и фауна» DJVU Google Books Open access Reference page.

Links
Drepanophycaceae is a family of extinct lycophytes[1] of Late Silurian to Late Devonian age (427 to 359 million years ago), found in North America, China, Russia, Europe, and Australia.
Description

The stems are several mm to several cm in diameter and several cm to several metres long, erect or arched, dichotomizing occasionally, furnished with true roots at the base.[2] Vascular bundle an exarch actinostele, tracheids of primitive annular or helical type (so-called G-type). Leaves are unbranched microphylls several mm to 2 cm or more long with a single prominent vascular thread, arranged spirally to randomly on the stem. Homosporous sporangia borne singly on the upper leaf surface or in an axillary position.[3]

Drepanophycaceae differs from a related family of the same period, Asteroxylaceae, in having vascularized microphylls;[3] see Drepanophycales for more details.
Genera

The genera in the family are:[2]

Drepanophycus Göppert (type genus)
microphylls short, tapering rapidly from wide base (thorn-shaped)
microphylls arranged spirally or randomly on stem
sporangia borne on upper surface of microphylls
Baragwanathia Lang & Cookson
microphylls long, not tapering over most of length (strap-shaped)
microphylls arranged spirally on stem
sporangia borne axially (whether on microphylls or on stem is not known)

Notes

"Drepanophycaceae". www.scientific-web.com. Archived from the original on March 1, 2012.
Hueber 1992, p. 491 (Baragwanathia) and 492 (Drepanophycus)

See tables 2 & 3 in Gensel (1992) for list of these anatomical details.

References
P. G. Gensel (1992), "Phylogenetic relationships of the zosterophylls and lycopsids: evidence from morphology, paleoecology, and cladistic methods of inference", Annals of the Missouri Botanical Garden, 79 (3): 450–473, doi:10.2307/2399750, JSTOR 2399750
F. M. Hueber (1992), "Thoughts on the early lycopsids and zosterophylls", Annals of the Missouri Botanical Garden, 79 (3): 474–499, doi:10.2307/2399751, JSTOR 2399751