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| Record Summary | in shallow rock pool on upper shore |
| Found as | |
| Date | 4 July 2008 |
| OS grid ref | OSGR: TA08 |
| Lat/Lon | 54° 20’ N, 0° 20’ W |
| Vice County | North-east Yorks, VC no: 62 |
| Country | England |
Notes: A small, delicate, pale lettuce green alga growing as vertical tufts in shallow rock pools. Cells filled with a parietal chloroplast mass, to 630µm long, becoming shorter towards branch tips: 54µm tapering to 46µm. Basal cell 620µm, without rhizoids near the holdfast. Branching distal, 1(2) branches, falcate. Some branches composed of short barrel-shaped zoidangia, which become hyaline on release of spores.
The following literature was used to identify this find:
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