96 FLORA ORCADENSIS. 
reported by Col. H. H. Johnston, C.B., and Dr 
Fortescue. 
550. L. ALPINUM (Linn.), Alpine Club-moss. Rare. 
I have seen it above U.F. Manse, Evie; Bigswell 
Hill, Stenness ; Wideford Hill, and Harray. 
551. L. iInunpatTuM (Linn.), Marsh Club-moss. 
Near Pegal Burn, Walls (1848, R. Heddle). I 
have not got a specimen of this. 
552. L. SeLaco (Linn.), Ftv Club-moss. Common. 
ORDER LXII—SELAGINELLACE. 
Genus CCL.—_SELAGINELLA (Spring). 
553. S. SELAGINOIDES (Gray). Common. 
Genus CCLI.—ISOETES (Linn.) 
554. I. LacuSTRIS (Linn.), Quadl-wort. 
Said to be found in loch on Knitchin Hill, 
Rousay ; Carness; Orphir. There is some doubt 
attached to this. Dr Fortescue says :—“I have often 
looked for it in Orkney, but never found it. I have 
seen it on shores of lochs on the Grampians.” Dr 
Boswell remarks, “ Likely only Littorella.” 
OrDER LXIII—EQUISETACEA, Aorse-tail. 
Genus CCLIL—EQUISETUM (Linn.) 
555. E. ARVENSE (Linn.), Corn Horse-tacl. Common. 
