IDNAME urn:idName:fossilplants.info:species:1D1CA1B7-5500-40EE-ABA8-9D015A2E1142 species
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Botryopteris trisecta

Botryopteris trisecta Mamay, H.N. Andrews Bull. Torrey Bot. Club, 77(6): 483. 19 Dec 1950
Name
Botryopteris trisecta
Rank
Species
Generic Name
[Genus] Botryopteris
Authors (Pub.)
Mamay S. H. Andrews H. N.  
Publication
A contribution to our knowledge of the anatomy of Botryopteris [1950/12]
Journal
Bulletin of the Torrey Botanical Club
Volume
77
Issue
6
Page number
483
Year
1950

Parent Taxon
[Genus] Botryopteris
Fossil Status
stems (with petioles & pinnae)

Stratigraphy
Upper Pennsylvanian
Strat. comment
McLeansboro Group
Location
Southern Illinois, USA
Paleoregion
Laurussia (Laurentia)
Data for Holotypus
Repository
Henry Shaw School of Botany, St. Louis, USA
Repository Number
WCB684
Diagnosis
Stem niot exceeding 1 cm. in diameter; cortex with a median zone of dense sclerotic-secretory tissue; stele terete, protostelic, to 2 mm. in diameter, with exarch xylem; ultimate pitting multiseriate-reticulate. Peti- olar segments departing at divergences of 120 degrees, and trisecting to form a median petiole and two lateral primary pinnae. Petioles to 6 mm. in diameter with tridentate traces 1.2 mm. wide, the arms directed adaxially with protoxylem at the tips of the arms and along the outer surfaces of the lateral arms; proiloLnnced intra-xylary selerenchyma present. Primary pinna segments trisectinig to form median, distal and proximal secondary pinnae. Distal secondary pinniae averaging 3.5 mm. in diameter, with small terete traces, and dividing di or trichotomously. Median secondary pinnae averaging 5 mm. in diameter; traces tridentate, to .8 mm. in width, and with the arms directed toward the parent petiole. Proximal secondary pinnae averaging 5 mm. in diameter, with generally stem-like organization of tissues. Pinnae dividing repeatedly, more or less dichotomously, one branch or each divisioni assuming a pendant position and ultimately dichotomizing. Roots diarch, not exceeding 1 mm. in diameter. Epidermis with multicellular hairs reachinig 900 µm in length


Nomenclatural synonyms (basionyms)

Species
Botryopteridium trisectum

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