Glenrosa J.Watson & H.L.Fisher, 1984 emend. Srinivasan (1992)

Moreau, Jean-David, Néraudeau, Didier, Philippe, Marc & Dépré, Éric, 2017, Albian flora from Archingeay-Les Nouillers (Charente- Maritime): comparison and synthesis of Cretaceous meso- and macro-remains from the Aquitaine Basin (southwestern France), Geodiversitas 39 (4), pp. 729-740 : 732

Genus Glenrosa J.Watson & H.L.Fisher, 1984 emend. Srinivasan (1992)

Glenrosa carentonensis

Moreau, Néraudeau, Tafforeau & Dépré, 2015 ( Fig. 3D, E )

MATERIAL. — 1 specimen: IGR 2769c.

DESCRIPTION

The specimen consists of a single shoot 10 mm long and 3.5 mm in diameter. Leaves are helically arranged. They are small, claw shaped and up to 3 mm long and 1.5 mm wide. They show a short free part.The leaf margin is entire and the apex is rounded.

R EMARKS

The gross morphology and dimensions of the specimen are close to that of Glenrosa carentonensis described by Moreau et al. (2015) from the Cenomanian flints from Charentes. This conifer is characterized by an unusual stomatal arrangement inside deep crypts. These crypts consist of ampulla-shaped pits that are sunken in the mesophyll and contain stomatal apparatuses.

Figures

FIG. 3. — A, Geinitzia Endl., 1847, leafy axis showing pointed and spirally arranged leaves;Géosciences Rennes, IGR 2769b; B, detail of A; C, Frenelopsis Schenk, 1869, leafy axis showing three small tips (arrows) on the apex, Géosciences Rennes, IGR 2769a; D, E, Glenrosa carentonensis Moreau, Néraudeau, Tafforeau & Dépré, 2015, leafy axes showing short and spirally arranged leaves, Géosciences Rennes, IGR 2769c. Scale bars: 1 cm.