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Hostinella heardii
Hostinella heardii D. Edwards Rev. Palaeobot. Palynol., 29: 199. 25 Sep 1980
- Name
- Hostinella heardii
- Rank
- Species
- Generic Name
- [Genus] Hostinella
- Authors (Pub.)
- Edwards D.
- Publication
- Studies on Lower Devonian petrifactions from Britain 1 [1980/9]
- Journal
- Review of Palaeobotany and Palynology
- Volume
- 29
- Page number
- 199
- Year
- 1980
- Fossil Status
- stems
- Stratigraphy
- Pragian
- Strat. comment
- Senni Beds, Breconian Stage
- Location
- Brecon Beacons Quarry; abandoned roadside quarry near Storey Arms, on the A470 between Brecon and Merthyr, approximately 12 km (71A miles) south of Brecon, Powys, Wales, U.K.
- Paleoregion
- Laurussia (Avalonia)
Data for Holotypus
- Repository
- Natural History Museum, London, U.K.
- Repository Number
- DE.32/4
- Diagnosis
- Smooth axes at least 10 cm long and 2.0--3.0 mm wide which branch dichotomously and appear flexuous. One axis with a single rounded lateral protuberance, 2.0 mm long and 1.5 mm wide. Surface of axes striated. Xylem in absence of branching consists of a terete strand of tracheids at least 450 pm in diameter. Tracheid diameter 15--45 pm with majority 40 pm in diameter. ?Centrarch. Tracheidal secondary thickening is annular with bars 1--1.5 tim wide and 3--6 pm apart. Smaller tracheids have more widely spaced bars. Phloem and inner cortex not preserved. Outer cortex composed of 1--2 rows of thick-walled elongate cells; 25--50 t~m in diameter (with majority 45 pm wide) and at least 300 pm long. ?Epidermis of small fusiform cells.
