0¥ THE KAYICULE.E. 



931 



slender-lanceolate, rather obtuse^ loosely 

 scattered. = Scliizonema nehulosum, KA. 

 p. 99. ])alniatia. '* Kiitzing is right in 

 remarking that my Schizonema nehulosum 

 corresponds to M. torquatum in the form 

 and dimensions of the naviculae. Al- 

 though when dried upon paper it only 

 forms a light cloud, yet, when diligently 

 examined, it proves similar in ramifica- 

 tion to Harvey's species " (Me. p. 445). 

 1-1080". 



M. Wyattii (Harv.). — Frond carti- 

 laginous, setaceous at base, much 

 branched ; branches capillary, erect, 

 straight, with acute axils, tapering to a 

 fine point 5 naviculae lanceolate, densely 

 packed in jelly. = Schizonema Wyattii, 

 Harv. Manual, p. 211. England. Forms 

 globose tufts. This species comes near 

 S. Smithii, but is much more slender, 

 and opens more readily and with greater 

 elasticity after being dried. 



M. moUe (S.). — Frond gelatinous, 

 simple below, membranous by cohesion 

 above ; margin much divided, into acute 

 segments ; naviculae in crowded files ; 

 valves lanceolate, acute, with 48 striae 

 in 'OQV'.^ Schizonema molle, SD. ii. p. 77, 

 pi. 68. £ 365. Britain. -0012" to -OOlo". 

 The naviculae are very like those of M. 

 helminthosum, but the form and structm-e 

 of the frond are altos-ether diiferent. The 

 frond is soft and fla 

 are firmly silicious 



M. diver gens (S.). — Frond simple be- 

 low, sparingly di\'ided or by cohesion 

 in-egularly snbmembranous above; valves 

 oblong-lanceolate, with 42 striae in -001". 

 = Schizonema diver gens, SD. ii. p. 76, 

 pi. 57. f. 363. Larne Lough. -0013" to 

 •0018". Eemarkable for the diftused 

 aiTangement of the primary divisions. 

 The species is closely allied to M. Smithii 

 and M. toi'quatujn. 



M. sirospermum (K.). — Frond rather 

 stout, rigid, olive, cartilaginous, much 

 branched; branches imequal, irregular, 

 curved, setaceous; naviculae lanceolate, 

 in dense series, often inflated into glo- 

 bose; spermatia concatenate. KA. p. 109. 

 = Schizo7iema sirospermum, Me. England. 

 Perhaps a state of M. Smithii. 1-720". 



M. setaceum (K.). — Frond setaceous, 

 olive, rigid, subdichotomous ; branches, 

 lateral and terminal, abbreviated, spine- 

 like ; naviculae in crowded series ; valves 

 lanceolate, acute. KB. p. 117, pi. 25. 

 f. 2, S. = Schizonema setaceum, Me. Adri- 

 atic Sea. 1-720" to 1-696". Spermatia 

 elliptic-globose. 



M. corymhoswn (Ag., K.). — Frond 

 arborescent, rather stout at the base, 



firm, rigid, yellowish, much branched; 

 branches setaceous, rigid, here and there 

 corymbose ; naviculai in distinct, close 

 series ; valves elliptic-lanceolate. KB. 

 p. 117, pi. 27. f. 9. = Schizonema corym- 

 hosum, AD. p. 21. England. 1-960". 



M. hydruroides (K.). — Fronds greenish 

 or brown, ultra-setaceous, rigid ; branches 

 elongated ; ramuli fasciculated, capillary ; 

 naviculae in close series, minute, rather 

 broad ; valves with rounded ends. = 

 Schizonema hydruroides, KB. p. 114, pi. 26. 

 f. 7. Heligoland. 1-1380". 



M. Bryopsis (K.). — Frond green, seta- 

 ceous, rigid, branched ; branches scat- 

 tered, superior ones patent, obtuse ; na- 

 viculae oblong, trimcate in front, and 

 roimded in lateral view. = Schizonema 

 Bryopsis, KB. p. 114, pi. 26. f. 8. Heli- 

 goland. 1-680". 



M. trichocephalum (K.). — Frond green- 

 ish-yellow, ultra-setaceous, rigid, tufted, 

 sparingly branched ; inferior branches 

 scattered, simple ; terminal ones crowded, 

 curved, subulate, capitate ; naviculae in 

 very close series, minute. = Schizonema 

 trichocephalum, KB. p. 114, pi. 27. f. 3. 

 Heligoland. 1-1440". 



M. capitatum (K.). — Frond pale green, 

 setaceous ; branches elongated, slender, 

 virgate, with a corymbose, capitate, acute 

 apex ; naviculae in distinct series, minute j 

 valves lanceolate. = Schizonema capita- 

 turn, KB. p. 114, pi. 27. f. 4. Heligoland. 

 1-1200". 



M. myxacanthum (K.). — Less stout 

 than M. corymhosum, gelatino-cartila- 

 ginous, pale brown ; branches diverging, 

 attenuated at the base, digito-multifid 

 at the apex ; divisions patent, acute ; 

 series of lanceolate naviculae at base 

 few and loose, above more numerous, 

 crowded at the apex. I^. p. 117, pi. 24. 

 f. 8. = Schizonema myxacanthum. Me. 

 Adriatic Sea. 



M. aureum (K.). — Frond arborescent, 

 setaceous at base, rather rigid, ochra- 

 ceous-yellow, much branched, fastigiate ; 

 branches capillary, pale, mucous ; series 

 of naviculae and tubes distinct, crowded ; 

 valves lanceolate. KB. p. 117, pi. 27. f. 8. 

 = Schizonema aureum. Me. Sidmouth. 

 1-960". 



M. obtusum (Grev.). — Frond robust, 



setaceous, elastic, firm, iiTegularly dicho- 



tomous, with roimded axils and obtuse 



apices ; naviculae minute, crowded in 



iiTegular files; valves elliptic-oblong. = 



Schizonona obtusum, GvevlSF. vi. pi. 302; 



, SD. ii. p. 78, pi. 58. f. 368. Britain. 



I The naviculae are excessively crowded, 



! and we are uncertain whether this spe- 



3o2 



