Frenelopsis oligostomata Romariz

Plant Fossil Names Registry Number: PFN003651

Act LSID: urn:lsid:plantfossilnames.org:act:3651

Rank: species

Genus:

Reference for this name: Romariz, C. M. (1946): Estudo e revisâo das formas portuguesas de Frenelopsis. – Boletim do Museu e Laboratório Mineralógico e Geológico da Faculdade de Ciencias / Universidade de Lisboa 14: 135–150. Not public

Page of description: 144, 146

Types

Lectotype 22900, Geological Museum of Lisbon, Portugal
designated in Mendes, M. M. & Kvaček, J. (2026): New data on the cheirolepidiaceous conifer Frenelopsis oligostomata from the Upper Cretaceous of Esgueira (Aveiro), Portugal. – Rev. Palaeobot. Palynol. 354: 105670 (1–10).
Figures: Figs. 2A, 3A–E, 6A, B
PFNR Number: PFN003652 / Act LSID: urn:lsid:plantfossilnames.org:act:3652

Original diagnosis/description

Espeoe citee comme Fr. occidentalis par W-enceslau de Lima (Com. Serv.Geol. Port. Tom. IV) et plus tard, comme Fr. af. hoheneggeri (Ett.) Schenk par C. Teixeira (Fl. Cret. de Esgueira (Aveiro). Port. Act. Biol. ser. B, Vol. 3-4). ·Provient du Senonien de Esgueira (Aveiro). Stomates disposes irregulierement. Densites stomatique et cellulaire respectivement 3,2 et 58,4 pour 250 μ2 • Dimension moyenne des stomates 25,73 x 38,08 et dimension moyenne des cellules cuticulaires 22,00 X 22,00 µ.

Emended diagnosis

Partly according to Alvin (1977). Segmented axes consisting of nodes and internodes. Branching penultimate, somewhat zigzag. Each segment bearing whorls of three laterally fused leaves, short free leaf tips round with marginal fringe of trichomes sheathing nodal area. Adaxial cuticle thin with irregularly spaced stomata surrounded by four subsidiary cells. Abaxial cuticle of older internodes smooth or wrinkled, younger internodes papillate. Stomata arranged in irregularly spaced rows with 1–4 ordinary cells between each row, rows somewhat obscure due to rather distant spacing of stomata; in apical parts of internodes stomata arranged irregularly. Stomata surrounded by four to five subsidiary cells. Stomatal chamber rounded to elliptical in outline, surrounded by circular Florin rings. Florin rings sometimes obscurely lobed, the number of lobes equalling the number of subsidiary cells. Two short, wide papillae in the throat of the pit, frequently occluded by a plug.

Stratigraphy

Cretaceous, Upper Cretaceous, Campanian
Campanian based on palynoflora (Medus, 1981).

Locality

Portugal
Esgueira fossil site, located at the northeast of Aveiro, in the northern subdomain of the Lusitanian Basin, Beira Litoral region, western Portugal

Plant fossil remain

macro- and meso-fossils-embryophytes except wood - gymnosperm

Comments

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