Back
Hydropteris pinnata
Hydropteris pinnata G.W. Rothwell, Stockey Amer. J. Bot., 81(4): 481. 15 Apr 1994
- Name
- Hydropteris pinnata
- Rank
- Species
- Generic Name
- [Genus] Hydropteris
- Authors (Pub.)
- Rothwell G. W.
Stockey R. A.
- Publication
- The role of Hydropteris pinnata gen. et sp. nov. in reconstructing the cladistics of heterosporous ferns [1994/4]
- Journal
- American Journal of Botany
- Volume
- 81
- Issue
- 4
- Page number
- 481
- Year
- 1994
- Parent Taxon
- [Genus] Hydropteris
- Fossil Status
- stems (with reproductive organs)
- Stratigraphy
- Maastrichtian
- Location
- Riverbank exposure on the north side of the St. Mary River approx. 50 m below the spillway of the St. Mary Reservoir, east of Cardston, Alberta, Canada
- Paleoregion
- America (North)
Data for Holotypus
- Repository
- University of Alberta, Department of Geology, Edmonton, Canada
- Repository Number
- UAPC-ALTA S36,881
- Diagnosis
- Rhizomes 1-2 mm in diameter, bearing unbranched roots in both nodal and internodal regions. Fronds up to approximately 6 cm long, with seven to 15 subopposite to alternate, ovoid to elliptical pinnae with anastomosing veins; up to 1.3 cm long and 0.4 cm wide. Sporocarps ellipsoidal, up to 2 cm long, clusters of mi- crosporangiate massulae subspheroidal to ellipsoidal to obconical, 0.7-1.3 mm long, 0.3-1.1 mm in maximum diameter; consisting of 30-40 massulae 0.18-0.50 long with length/width ratio of 1.5-3.5:1. Massulae alveolar, bearing spheroidal, trilete microspores 21-37 ,um, with thin, smooth exine. Megaspore complexes 0.45-0.87 mm long, 0.37-0.50 mm wide, with distal floats more or less differentiated.
