I 39 
P. pectinatus (L.). Fig. 662. Fennel-leaved Pondweed. Native. 
P. VI, VII. 
Ponds and streams. Occasional. 
L. At intervals in the canal between Liverpool and the limits 
of the district (H.). 
C. Pond near Poulton Bridge (D.). Ditch near Leasowe 
Lighthouse (j.h.l.). At intervals in the canal between Elles- 
mere Port and Chester (f.m.w.; r.b.). Helsby Marsh. 
b. scop ar ins (Wallr.). 
L. Ditches near the Decoy at Hale (r.b.). 
C. Frodsham Marsh (j.f.r.). 
Authorities for Potomogeton , Alfred Fryer and Arthur Bennett. 
Ruppia (L.). Tassel Pondweed. 
R. spiralis (Hortm.). Greater Ruppia. Native. P. VII, VIII. 
Salt water pools and ditches. Occasional. 
L. Crosby (H.). 
C. Bidston Marsh (H.). Salt marshes below Puddington 
(LorddeT.; F.M.W.). 
R. rostellata (Koch.). Fig. 663. Lesser Ruppia . Native. P. VI-VIII. 
In salt water pools and ditches. Occasional. 
C. Seacombe (j.h.l.). Bidston Marsh (r.b.). S. U. Canal 
(Dr. G.). 
Zannichellia (L.). Horned Pondweed. 
Z. palustris (L.). Fig. 66$. Horned Pondweed. Native. A. or 
P. V-VIII. 
Ponds and ditches. Frequent. 
L. Formby to Halsall ; Barton and Halsall. 
C. Great Mollington ; Burton Marsh ; Leasowe ; Bidston 
Marsh ; Langfields, West Kirby ; Parkgate. 
Z. pedunculata ( Reichb .). Stalk-fruited Horned Pondweed. Native. 
A. or B. V-VIII. 
Ponds and ditches. Rare. 
L. Southport (t.g.). 
C. Frodsham (j.f.r.). Between Ellesmere Port and Stanlow; 
Ditches inland of Heswall Point ; Bidston Marsh (r.b.). 
Zostera (L.). Grasswrack. 
Z. marina (L.). Grasswrack. Native. P. (?) VII, VIII. 
Saltwater pools and ditches. Rare. 
L. Near the mouth of R. Alt (H.). 
C. Hoylake (D.). 
Note.— There are no recent records ; it is probably extinct 
