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Araucaria balcombensis
Taxonomy
Araucaria balcombensis was named by Selling (1950). It is not extant. It is considered to be a form taxon.
Sister species lacking formal opinion data
Synonymy list
Year | Name and author |
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1950 | Araucaria balcombensis Selling p. 218 |
1990 | Araucaria balcombensis Hill p. 218 figs. 31-35 |
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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.
†Araucaria balcombensis Selling 1950
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Diagnosis
Reference | Diagnosis | |
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R. S. Hill 1990 | Leaf thick, about 32 mm long, 16 mm wide, arrangement on axis unknown. Numerous parallel veins present. Leaf amphistomatous. Stomatal plugs with smooth, flat surface. Outer cuticular surface with numerous papilla-like structures. Stomata on adaxial surface often oblique or transverse in orientation. Guard cells level with hypodermis, subsidiary cells usually four, sometimes five or six. Cuticle on subsidiary cells very thick, granular, with occasional smooth areas, outer flange rim varying in thickness, oval. Flange between guard and subsidiary cells well developed, irregular. Small polar extensions sometimes present. Flange between guard cells thick, smooth or granular, polar extensions present. Cuticle on guard cells granular, grooved for almost entire length on most stomata. Small ridge present at poles above polar extension. Epidermal cell walls not sinuous, buttressing absent. Cuticle very thick and partially enclosing inner epidermal cell wall surface. |