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Cycadolepis coriacea
Taxonomy
Cycadolepis coriacea was named by Villar de Seoane (2001). It is not extant. It is considered to be a form taxon.
Sister species lacking formal opinion data
Synonymy list
| Year | Name and author |
|---|---|
| 2001 | Cycadolepis coriacea Villar de Seoane |
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If no rank is listed, the taxon is considered an unranked clade in modern classifications. Ranks may be repeated or presented in the wrong order because authors working on different parts of the classification may disagree about how to rank taxa.
†Cycadolepis coriacea Villar de Seoane 2001
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| L. Villar de Seoane 2001 | Simple scale-leaf oblong or ovallanceolate 2.8 cm long and 2.0 cm wide. Abaxial side convex, with incurved margins, acute apex and wide base. Veins parallel in lower part, dichotomizing and anastomosing with a concentration of 12 per cm, terminating at the margins. Adaxial epidermis with rectangular, occasionally isodiametric cells 57 m long and 25 m wide. Surface smooth. Abaxial epidermis with rectangular, occasionally isodiametric cells 70 m long and 31 m wide. Surface with trichome bases. Scale-leaf amphistomatic. Paracytic stomatal apparatus 91 m long and 41 m wide. Subsidiary cells with transverse striae. Hypodermis present. Ultrastructurally, epidermal external wall with an upper layer 0.60 m thick; a middle layer 3.10 m thick; and a lower layer 0.80 m thick. |