CRYPTOGAME. 97 
556. E. synvaticum (Linn.), Wood Horse-tail. 
Local; rather searce. 
557. E. PALosTRE (Linn.), Marsh Horse-tail. 
Common. 
558. E. trmosuM (Linn.), Smooth Naked Horse-tail. 
Common. 
559. E. PRATENSE (Ehrh.), Blunt Horse-tail. 
This horse-tail is pretty common in Deerness and 
Upper Sanday, St. Andrews. It was unknown in 
Orkney till a few years ago. Mr Ar. Bennett says :— 
“This is a very interesting addition to Orkney flora. 
It does not occur in Shetland nor the Fzroes, but is 
found in Iceland and Sweden.” 
OrDER LXIV.—CHARACE i. 
Genus COLIIL—NITELLA (Agardh). 
560. N. opaca (Agardh). Fairly common. 
Swanbister, Rennibister, near Stromness, We. 
Genus CCLIV.—CHARA (Linn.) 
561. C. FRAGILIS (Desv.) Fairly common. 
Var. delicatula. Plentitul round shores of Loch 
Harray (Dr Fortescue). 
Var. approaching barbata. Shallow pools north- 
west of Stones of Stenness (Dr Fortescue’s list). 
562. C. ASPERA (Willd.) 
Skail, Harray Loch, Papa Westray, Holm. 
H 
