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Protophyllum semotum
Protophyllum semotum L.J. Hickey Mem. Geol. Soc. Amer., 150: 131. 19 Jul 1977
- Name
- Protophyllum semotum
- Rank
- Species
- Generic Name
- [Genus] Protophyllum
- Authors (Pub.)
- Hickey L. J.
- Publication
- Stratigraphy and paleobotany of the Golden Valley Formation (Early Tertiary) of Western North Dakota [1977/7]
- Journal
- Memoirs of the Geological Society of America
- Volume
- 150
- Page number
- 131
- Year
- 1977
- Fossil Status
- leaves
- Stratigraphy
- Thanetian
- Location
- Western pit of the Hebron Brick Company, Morton County, North Dakota, USA
- Paleoregion
- America (North)
Data for Holotypus
- Repository
- National Museum of Natural History, Smithsonian Institution, Washington, USA
- Repository Number
- USNM 43608
Data for Paratypus
- Repository
- National Museum of Natural History, Smithsonian Institution, Washington, USA
- Repository Number
- PU 20097; USNM 167522
- Diagnosis
- Leaves ovate to narrow ovate, l / w ratio 1.6 to 1.9; / 13 to 15 cm; w 6.8
to 9.5 cm; apex acuminate; base peltate, rounded or lobate with the petiolar attachment situated somewhat above it; margin toothed; teeth dentate or slightly asymmetric, narrow, in two orders with the larger set occasionally cut by a third-order tooth, tooth apices swollen and apparently glandular; leaf texture chartaceous, possibly hairy on one surface; tips of teeth and vein endings in them thickened and probably glandular. Venation pinnate, midvein of moderate thickness; secondaries craspedodromous, in 10 to 12 principal subopposite pairs diverging at narrow to moderate angles (35° to 50°), although some of the secondaries at the base of the midrib diverge at angles of from 90° to 150°; lower secondaries with outer branches, upper secondaries occasionally branched; course nearly straight or slightly arched,
becoming recurved and branching in a characteristic manner before entering the teeth. Tertiaries relatively distant, archingly percurrent, admedial angle of origin obtuse, exmedial angle acute; tertiaries much thinner than the secondaries, almost as fine as the higher order venation. Higher order venation forming a reticulum; highest order of venation, sixth; rank of highest order showing excurrent branching, fifth; areoles equant and quadrangular,
0.3 to 0.5 mm in diameter, without freely ending veinlets.
