THE FLORA 181 



P. heterophyllus, c graminifolius (Fr.). Loch Sgoltaire. 

 August. 



P. nitens, Weber. West Loch Fada. July. 



P. perfoliatus, L. West Loch Fada. July. 



P. pusillus, L. Slender Pondweed. West Loch Fada; 

 common. July. 



P. pusillus, b tenuissimus, Koch. Middle Loch Fada. (A 

 later examination of specimens leads Mr Bennett to hope 

 that this may turn out to be P. trichoides, Cham.) 



P. Sturrockii, Ar. Benn. Loch Sgoltaire and Loch Fada. 



P. pedinatus, L. Fennel Pondweed. Pools, western 

 shores. August. 



P. jUiformis, Xolte. Pools, western shores. 



Ruppia, L. 



R. maritima, L. Shore pool, Poll Gorm. July. 

 R. rostellata, Koch. Tassel Pondweed. Shore pools, 

 south of Port Mor. June. 



Zannichellia, L. 



Z. palustris, L. Horned Pondweed. Shore pools, 

 Machrins. August. 



Zostera, L. 



Z. marina, L. Grasswrack. Bilearach. Abundant, 

 growing where sediment has been deposited in the sea, 

 and frequently washed ashore. July. The long, grass-like 

 leaves, when dried, are used for packing, and for stuffing 

 mattresses. W. 



Naias, L. 



N.flexilis, Rostk. and Schmidt. Slender Naiad. Found 

 in the three divisions of Loch Fada. August. "A very in- 

 teresting find. For many years it was only on record from 

 Ireland ; then my late friend Abram Sturrock found it in 

 East Perth, and Dr White in Mid Perth. It is rare in 



