A NEW CAKEX FEOM SUMATRA. 35 



8. CosMARiuM TuRPiNi Breb. n. var. cambricum. — Rather 

 smaller tliau the t,ypical form, more rotundate, less truncate ; basal 

 angles less protruded ; form of central inflation two distinct ovals 

 set obliquely ; composed of oblong granules. Length GO /x, thick- 

 ness including inflation 35 [x, width 50-60 p,, breadth of isthmus 

 17 |tx. Col. J. E. Griffiths, F.L.S. Bangor, N. Wales, 1881. 



9. Closterium Braunii Reinscli., De speciebus generibusque, 

 nomiullis novis Ex. Alg., P. Reinsch, 1867, Tab. 1. c. — Sparingly 

 among other Algre. Pictou, Nova Scotia, 1884. 



10. Penium spinospermum n. sp. — Small, about two and a 

 quarter times longer than wide, subcylindrical, with a very slight 

 median construction ; apices round, very slightly attenuated ; mem- 

 brane smooth ; zygospores in young state globose and smooth, 

 when mature thickly covered with obtuse projections. Length 

 33 fjL, breadth 25 /x, breadth of zygospore (s. acul.) 23 /x, length of 

 processes 7i i^.. Derrystrasna Bog, Co. Armagh, Ireland. Rev. 

 H. W. Lettf 



11. Penium phymatosporum Nordst., Desmidiete et (EdogoniesB 

 ab 0. Nordstedt in Italia et Tyrolia collectae, Tab. xii. f. 1., p. 

 26. — Four or five specimens of the spore of this Desmid, with 

 cells attached, occurred in a collection made by me at Minety, in 

 September, 1881, from which my drawing was made. New to 

 Britain. It bears a close resemblance in shape of plant and in 

 form of the remarkable zygospore to the Italian specimens ; but I 

 have not been able to detect the longitudinal strisae in the mem- 

 brane which Nordstedst's specimens appear to possess, somewhat 

 similar to P. polymorphum Lund. 



Explanation of Tab. 254. — 1. Euastrum incavatum Josh, et Nordstedt, from 

 the fig. in Wittr. & Nordstedt's Alg. Exsic, x 570. 2. Euastrum verrucosum 

 Ehrb. f. simplex n. var., x -±50. 3. Cosmarium viridis Corda, x 450. 



4. Micr aster ias ceratophora, n. sp., x 450. a, front view; b, side view. 



5. Xanthidium antilopeum Breb. f. canadense ; front and end view, x 450. 



6. Arthrodesmus gibberulus n. sp., x (iOO. a, front view; b, end view. 



7. Staurastrum minicsculum, n, sp., x COO. 8. Cosmarium Turpini Breb., f. 

 cambricum n. var., x 450. 9. Closterium Braunii Reinsch. a, plant in front 

 view, x 300 ; b, a portion of same enlarged, x 900 ; c, apex, x 900, 

 10. Penium spinospermum, n. sp., x 450. 11. Penium phymatosporum Nord- 

 stedt, X 450. 



/ 



/ A NEW CABEX FROM SUMATRA. 

 By H. N. Ridley, M.A., F.L.S. 



O Carex tartarea, n. sp. — Rhizomate brevi ; foliis glaucis copi- 

 osis confertis rigidis, linearibus acumiuatis recurvis perscabris ; 

 culmis crassiusculis pedalibus triquetris rigidis ; foliis caulinis 

 4-5 ampliatis ; spiculis femineis uncialibus peduuculatis numerosis 

 e vaginis inferioribus emergentibus ; spiculis masculis panels termi- 

 nalibus ; squamis lanceolatis obtusis purpureis apice scariosis 

 mucronatis carinatis, mucrone scabro ; utriculis rostratis elongatis 

 excurvis utrinque angustatis, marginibus scabris nigris lucidis ; 



