Name: Fucus gardneri silva (Formerlly Fucus evanescens)
Family: Fucaceae
Collection Date: 15 September 2011
Location: Nantasket Beach, Massachusetts
Collector: Dr. Matthew Hils
Key Used: Taylor, W. R. (1957). Marine Algae of the Northeastern Coast of North America . Ann Arbor : The University of Michigan .
Key to the Orders of the Marine Algae
1. Chlorophyll masked by accessory pigments … 3
3. Accessory pigments imparting a brown color; reproduction at some stage typically involving flagellate cells … 10
10. If filamentous, not polysiphonous, though often pluriseriate … 12
12. Massive, cylindrical, or phylloid, or slender but pluriseriate, or reduced types … 13
13. Filamentous structure lacking, obscured, or only shown in evanescent plant parts … 14
14. Sporophyte lacking free assimilators … 15
15. Gametophyte reduced to cytological phases; sporophyte massive and branched … Fucales p. 188
Key to Families
1. Axes subterete, to alate with a midrib, but not foliar; vesicles if present intercalary … Fucaceae, p. 189
Key to Genera
1. Branches strap-shaped at least above, with a thickened midrib … Fucus, p. 189
Key to Species
1. Margin not serrate, though often frayed … 2
2. Plants larger, regulary exceeding 15 cm … 4
4. Receptacles compressed … 5
5. Receptacles 1-2 as long as broad, blunt, the edges acute, often ridged or winged … F. evanescens, p. 193
Description:
“Plants, large, 2-6 dm. tall, the basal disks round-concial, branching widely dichotomous or alternate, the fronds markedly tending to spread in a plane, the blades wide, 1-2cm. broad, evesiculate, the cryptostomata obvious; costate in the middle portions of the plant with broad membranous margins, the midrib disappearing above, but strong and often denuded below; receptacles flat, simple or forked, broad and short, 1.5-2.0 cm. wide, 2-4 cm. long, obtuse or slightly dentate, the apex often ridged or winged, sharply demarcate from the sterile blade."
“Plants, large, 2-6 dm. tall, the basal disks round-concial, branching widely dichotomous or alternate, the fronds markedly tending to spread in a plane, the blades wide, 1-2cm. broad, evesiculate, the cryptostomata obvious; costate in the middle portions of the plant with broad membranous margins, the midrib disappearing above, but strong and often denuded below; receptacles flat, simple or forked, broad and short, 1.5-2.0 cm. wide, 2-4 cm. long, obtuse or slightly dentate, the apex often ridged or winged, sharply demarcate from the sterile blade."
Links:
Figure 1: Fucus gardneri close up
Figure 2: Another view of F. gardneri
References:
Taylor, W. R. (1957). Marine Algae of the Northeastern Coast of North America . Ann Arbor : The University of Michigan .
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