Sphenophyllum

Galtier, Jean, Ronchi, Ausonio & Broutin, Jean, 2011, Early Permian silicified floras from the Perdasdefogu Basin (SE Sardinia): comparison and bio-chronostratigraphic correlation with the floras of the Autun Basin (Massif central, France), Geodiversitas 33 (1), pp. 43-69 : 56

Sphenophyllum sp. ( Fig. 5G )

We only found two specimens of these small stems, partly decorticated but showing well-developed secondary xylem. There is no diagnostic feature allowing a specific identification. This genus extends up to the Early Permian where it has been found preserved as compressions at Autun (Igornay).

FERNS

Ferns, particularly marratialean tree ferns, are the most common element of the flora.

Figures

FIG. 5. — Silicified plants from the Permian of Sardinia: A-E, Palaeostachya sp.: A, longitudinal section of the cone showing the central axis with pith cavity (A) and three nodes with the attachment of bracts (B) and sporangiophore stalks (ST) arising obliquely. The bracts are often displaced at their base (B with two arrows) whilst their distal part is ascending vertically (see on the left) (S), de-