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Caytonanthus
Genus Caytonanthus T.M. Harris Meddel. Grønland, 1937, 112(2): 40. 10 May 1937
- Name
- Caytonanthus
- Rank
- Genus
- Authors (Pub.)
- Harris T. M.
- Publication
- The Fossil Flora of Scoresby Sound East Greenland. Part 5 [1937/5]
- Journal
- Meddelelser om Grønland
- Annee/Jahrgang
- 1937
- Volume
- 112
- Issue
- 2
- Page number
- 40
- Year
- 1937
- Parent Taxon
- [Family] Caytoniaceae
- Fossil Status
- fructifications (male)
- Type
- Caytonanthus arberi
- Diagnosis
- Pollen-bearing fructification consisting of a slender 'axis' probably only two or three centimeters long, hearing short lateral branches which are arranged irregularly but probably confined to the horizontal plane. Lateral branches themselves branched irregularly hut in one plane and terminating slight spathulate expansions, either produced singly on short branches or in groups of two or three where the ultimate branches are weakly developed. Each expansion bearing on its surface a single sessile 'anther' or synangium consisting of four (occasionally three) elongated pollen sacs arranged radially round a central core of tissue. Pollen sacs rounded in section, wall of pollen sacs thin. Anther typically 3-10 mm long, 1-2 mm wide with a pointed apex. Cuticle of main 'axis' delicate, showing straight-walled cells of slightly different dimensions on the two sides (i. e. dorsiventral). Cuticle of lateral branches showing elongated cells, anther-bearing expansions showing isodiametric straightwalled cells. Cuticle of anther very delicate and without hairs. Thickened cells hearing a short hair occurring on the 'axis' and branches. Pollen grains very numerous, often appearing to he packed in longitudinal rows in immature anthers. Pollen .grains transversely elongated, consisting of a central cell and two lateral 'air sacs'. Air sacs placed slightly asymmetrically, the central cell being slightly wedge-shaped; the pollen grain thus appearing curved when viewed from the side hut straight from above or below. Pollen grains of the order of 20-30 from wing to wing and 12-20 across.
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