330 THE FRESH-WATER LOCHS OF SCOTLAND 
550. Zygnema vaucherii^ Ag. 
551. Spirogyra crassa, Klitz. 
Desmidiaceae. — 552. Gonatozygon imnotcenmm^ De Bary. 
553. Spirotcmiia condensata^ Breb. Common. 
554. PeJiium spirostriolatimi^ Barker. Loch Rannoch. 
555. Netriiim digitus (Ehr.). Common. 
556. N. interruptuin^ Breb. LiOch Ness. 
557. N. nagelii (Breb.). Loch Ness. 
558. Closterium calosporum^ Wittr. Loch na Meide. 
559. C. cornu^ Ehr. Frequent. 
560. C. costatum^ Corda. Loch RanitDch. 
561. C. didy?notocum, Corda. Frequent. 
562. C. ehrenhergii^ Menegh. Caithness. 
563. C. hutzingii^ Nag. Common. 
564. C. lineatum, Ehr. Loch Rannoch. 
565. C. lumdd (MlilL). Common. 
566. C. ralfm, Breb. Loch Ness. 
567. C. rostraturii^ Ehr. Loch Ness. 
568. C setaceum^ Ehr. Common. 
569. C. striolatum, Ehr. Loch Rannoch. 
570. Pleurot(vnium coronatum^ Breb. Common in 
the north. 
571. P. nodosum (Breb.). Sutherland. 
572. Docidium iindulatum^ Bail. 
573. TetmemoTus granulatus (Breh.). Common. 
574. Euastrum affine., Ralfs. Common. 
575. E. ansatum^ Ralfs. Common. 
576. E. hidentatum^ Nag. Common. 
577. E. hinale (Turp.). Common. 
578. E. crassum (Breb.). Common. 
579. E. denticulatum (Kirchn.). Common. 
580. E. didelta (Turp.). Common. 
581. E. divaricatum^ Lund. Loch Rannoch. 
582. E. inerme (Ralfs). Sutherland. 
583. E. ohlongum (Grev.). Common. 
584. E. pectinaUirn (Breb.). Common. 
585. E. simiosum, Lenorm. Loch Ness. 
586. E. veiTucosum, Ehr. Very common. 
587. Micrasterias americana (Ehr.). Loch Ness. 
588. M. aplcidata, Ehr. Common in the north. 
589. M. hrachyptera^ Lund. Loch Ness. 
590. M. conferta^ I^und. Connnon in the north. 
591. M. denticulata,, Breb. Common. 
592. M.jcmneii, Ralfs. Loch Ness. 
