Marine Algce of Benvick-on-Tiveed. 283 



Sphacelaria cirrhosa, J. Ag., Spec. Alg. i., p. 34 ; Ktz., Spec. Alg., 

 p. 464. 



Hob. Epiphytic on Halidnjs siliquosa, Cladophora rupestris, and various 

 other Alga? between tide-marks. All the year. Fruit June and July. 

 Common. Berwick Bay, Burnmouth, Spittal, Holy Island, and elsewhere 

 along the coast. 



A common species forming dense tufts, from half an inch to 

 two inches long, on Fuci and other Algse. The branches are 

 given off at wide angles, and are sometimes regularly opposite, 

 sometimes irregularly placed ; the shortly pedicellate sporangia 

 are borne on the lateral branches. The propagula, which vary 

 very much in size and shape, are much more common with us 

 than the sporangia, which are rarely found on Berwick specimens. 

 "Apart from their different habits and place of growth, it is 

 difficult to assign exact marks by which to distinguish in all cases 

 S. cirrhosa and S. radicans. In the latter the secondary branches 

 are few and appressed, irregularly placed, never opposite, while 

 in the former they are numerous, given off at wide angles, and 

 frequently opposite." * 



Subgenus— PSEUDOCHJBTOPTERIS, Nob. 



Sporangia pedicellata in marginibus pinnarum regulariter 

 disposita, cetera ut in Chcetopteride. 



Sphacelaria plumigera, Holmes. 

 Grevillea, vol. xi., p. 145. 

 Exsicc. Sphacelaria plumigera, Holmes, Alg. Brit. Bar., no. 23. 

 Fir/. „ ,, Tab. Nostra x., fig. 1, 2, 3. 



Hob. In shallow sandy pools between tide-marks, usually near low-water 

 mark. All the year. Fruit Dec. — May. Rare. Sharper 

 Head, Scremerston. 

 This species is usually found in British Herbaria bearing the 

 name Sphacelaria plumosa, but as Holmes has shown it is not 

 identical with the plant described by Lyngbye under that name. 

 The globose shortly pedicellate unilocular sporangia are borne 

 on the plumose secondary branches, not as in Lyngbye's plant 

 ( Chcbtopteris plumosa) on short special branches arising from the 

 false cortex of the main axis. 



* Far low, Mar. Alg. New Eug., p. 77. 



