s A Field Guide to the British Seaweeds - NMBAQC

3. Plant generally found attached to rock surface and macroscopic……………..4
3. Plant found growing on other algae and typically microscopic…………....….5
4. Plant found growing on sand covered hard surfaces, pyrenoids highly visible
under the microscope with flower shaped chloroplasts, branching limited
Rhodothamniella floridula
4. Plant found in turfs generally in moist overhangs, branching limited with
reticulate (network system) chloroplast covering whole of cell
Audouinella purpurea
5. Plant with star shaped chloroplast several cells long commonly found on
Polysiphonia and Ceramium species Erythrotrichia carnea
5. Plant taking a variety of small microscopic forms, either as small erect forms a
few cells long or appearing as red spots or stains on other algae with erect
systems creeping throughout or over other algae
Audouinella sp. and Erythrocladia irregularis
Reduced species list identification guide as required by the Water Framework Directive 38