Zostem.] NAIADACE.E. 537 



and Old Fort, which are nearly all filled with this plant and Buppia, 1839. 

 [Brading marshes, A. G. More, Esq., Edrs.] 



W. Med. — Ditches at Freshwater, almost constantly with only a 2-celled anther. 

 In a pool on a moory pasture near Mottiston mill, in plenty, 1848. In a little 

 pool of fresh water near Gurnet bay. 



Stigmas rounded or very hroadly cordate, rather irregular in size and shape, but 

 never lanceolate, attached to the style near their circumference, delicately trans- 

 parent crystalline and colourless, like thin laminae of the clearest ice. Capsule 

 not toothed at the back, but bluntly tuberculate. 



Wahleuberg says the anther is occasionally either 2-, 3-, or 4-celled, but I 

 rarely find more than 2 cells, or the stigmas otherwise than rounded or very ob- 

 tusely angular, dentate on the margin and delicately transparent. 



For remarks on Z. palustris and Z. dentata see Hooker's Companion to the 

 Bot. Mag. No. VI. 



IV. ZosTERA, Linn. Grass-wrack. 



" Floivers imperfect. Stamens and pistils inserted in 2 rows 

 upon one side of a flat thin simcUx. Spatha foliaceous. Anthers 

 ovate, sessile, alternating with the ovate germens. Style bifid. 

 Fruit with 1 seed (bursting vertically, Wilson). Albumen 0." — 

 Br. Fl. 



1. Z. marina, L. Common Grass-wrack. Vect. Grassweed. 

 " Leaves linear 3 — 7 nerved, peduncle of the spatha thick shorter 

 than the linear spadix, achenes striated." — Br. Fl. p. 473. E. B. 

 t. 467. 



In shallow creeks and inlets of the sea, at the mouths of rivers, also in ponds on 

 salt-marshes, &c. Fl. July, August. Xf . 



E. Med. — About Ryde pier. Commonly thrown up on the shore at Ryde 

 after heavy gales. 



W. Med. — At the mouths of the Yar and Medina, and plentiful in the pools of 

 salt or brackish water on the marshes between Yarmouth and Freshwater. 



A troublesome weed in shallow waters, by impeding the passage of boats, as in 

 the Southampton river crossing over to Hylhe, &c., where it impedes the progress 

 df small craft. 



2. Z. nana, Roth. Dwarf Grass-wrack. "Leaves 1-nerved, 

 stipular sheaths truncate, peduncle of the spatha as long as the 

 spadix not thickened upwards, spadix short few-flowered with 

 extra marginal appendages." — Br. Fl. p. 473. Borr. in E. B. S. 

 t. 2231. 



In similar places with the last, and with which it is usually mixed. Fl. Au- 

 gust. 11. 



E. Med. Found in considerable abundance on the shore of Blading harbour, 

 near the ferry opposite Bembridge, by Dr. Bell-Salter, Nov. 26th, 1847. [On 

 the sand-head ofif Ryde, both on the East and West sides of the piei;, abundantly, 

 A. O. More, Esq., Edrs.] 



First detected as a British species by Mr. Sender, of Hamburgh, amongst sea- 

 weeds sent to him from Dover, and confirmed as such by Mr. Borrer, who gathered 

 it in flower abundantly on the mud of Poole harbour in August, 1847, and shortly 

 afterwards in Emsworth creek, which parts Sussex from Hampshire. 



3z 



