Lusistemon striatus K.R.Pedersen, Balthazar, P.R.Crane et E.M.Friis

Plant Fossil Names Registry Number: PFN002030

Act LSID: urn:lsid:plantfossilnames.org:act:2030

Authors: K. R. Pedersen, M. von Balthazar, P. R. Crane & E. M. Friis

Rank: species

Genus: Lusistemon K.R.Pedersen, Balthazar, P.R.Crane et E.M.Friis

Reference: Pedersen, K. R., von Balthazar, M., Crane, P. R. & Friis, E. M. (2007): Early Cretaceous floral structures and in situ tricolpate-striate pollen: New early eudicots from Portugal. – Grana 46(3): 176–196.

Page of description: 178

Illustrations or figures: figs 1–4

Name is type taxon for

Lusistemon K.R.Pedersen, Balthazar, P.R.Crane et E.M.Friis 2007

Types

Holotype S122091, Palaeobotanical Collections, Department of Palaeobiology, the Swedish Museum of Natural History, Stockholm, Sweden
Figures: figs 1A–E, 2F, 3C, D, F

Note: Holotype from the sample Vale de Agua 141.

Paratypes: S105028 (sample Vale de Agua 19), S101284 (part on SEM stub; part sectioned for TEM) and S105042 (sample Vale de Agua 141).

Original protologue

Staminate flower with six small tepals and six stamens of different sizes and apparently placed opposite the tepals. Anthers basifixed, attached to filament without distinct joint; filaments free from each other. Anthers dithecal and tetrasporangiate; thecae placed laterally; anther dehiscence by longitudinal slits. Connective poorly developed between thecae, but extended apically into a short protrusion. Pollen tricolpate, tectate and striate with dichotomising and sometimes anastomosing muri that are ornamented with minute, transversely oriented ridges. Infratectal layer thin, granular and forming a fine internal reticulum; foot layer thin.
Tepals narrow. Epidermis of anthers along the stomium papillate. Pollen grains circular to slightly elliptical in equatorial view and subangular in polar view with the colpi positioned in the centre of the flattened sides. Tectum striate in non-apertural regions. Muri of intercolpium aligned more or less parallel to the pollen grain polar axis forming a slightly undulating pattern, more strongly aligned over the poles. Granulae of infratectal layer form an internal reticulum. Colpus membrane verrucate with finely striate ornamentation on the verrucae.

Etymology

Referring to the striate pollen.

Stratigraphy

Cretaceous, Lower Cretaceous
"Complexos gresosos de Nazaré e de Cós-Juncal" – basal part (Famalicão Member) of the Figueira da Foz Formation (late Aptian or early Albian)

Locality

Portugal
Clay pit complex near the village of Vale de Agua, western Portugal (39°37′15″N, 8°51′30″W)

Plant fossil remain

macro- and meso-fossils-embryophytes except wood