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PL. 66.
Scale MJ! of a HWlmetre —100 [A
1. Efta-fintm otihngum var. integrum. 2. Cosmarium discretum Ben.
3. Cosmarium cymatopleurum Nordst. 4. Staurastrum turgescens Not.
5. Spirotcenia acuta llilse. 6. Genicularia spirotcenia LB a r y .
