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Lygodium dinmorphyllum
Taxonomy
Lygodium dinmorphyllum was named by Churchill (1969). It is not extant. It is considered to be a form taxon.
Sister species lacking formal opinion data
Synonymy list
| Year | Name and author |
|---|---|
| 1969 | Lygodium dinmorphyllum Churchill |
| 1992 | Lygodium dinmorphyllum Rozefelds et al. p. 207 figs. 4-10 |
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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.
†Lygodium dinmorphyllum Churchill 1969
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| A. C. Rozefelds et al. 1992 | Sterile pinnules asymmetrical, usually 2-3 lobed, although unilobate, quadrilobate and pentalobate pinnules occur. Lateral lobes tends to he longer than central lobes. Pinnule base is cuneate to truncate, apex rounded to acute. Pinnules petiole, lacking abcission node at pinnule base. Venation palmate, dichotomously branching from the central vein, on each lobe, two to three times before reaching leaf margin. Leaf length variable, maximum lobe length about 110 mm. Pinnule margin variable, undulose in larger specimens, smooth in small pinnae, rarerly lobed. Pinnules problably hypostomatic. Anticlinal walls of abaxial epidermis strongly sinuous, stomata anomocytic. Stomatal apparatus 30 µm long, (29-32 µm) and 27 µm wide (25-32 µm). Fertile pinnules in branched axes often lack lamina, although lamina sometimes present as narrow wings or flanges at the base of sorophores. Individual sorophores variable in size, ranging from about 4.0-14.0 mm in length, often united in groups of 2-4. Spores referable to Cyathidites splendens Harris, 1965. Sinuosity of anticlinal walls od epidermis on sorophore lamina not as pronounced as in sterile pinnules. |