932 



SYSTEMATIC HISTOEY OF THE IXFTJSOEIA. 



cies oiiglit not rather to be placed in 

 Scliizonema. "Frond thicker than a 

 hog-'s bristle, and nearly of equal diameter 

 throughout ; colour brownish-yellow, be- 

 coming yellowish-green in dying. A 

 handsome and distinct species, well 

 marked by its roimdish axils and obtuse 

 apices " (Haryey). 



IsL Blyttii (Ag.). — Frond elongated, 

 filiform, many times irregularly dicho- 

 tomous, with romided axils, cylindrical, 

 not attenuated; nayiculae in nimierous 

 parallel series. AD. p. 23. = Scliizonema 

 Blyttii, Me. Norway. An elegant and 

 remarkable species ; fronds erect. 



M. mesoglceoides (K.). — Frond stout, 

 very gelatinous, greenish, irregularly 

 branched ; branches dense, numerous, 

 unequal ; ramuli incrassated at the apex, 

 patent; nayiculfe rather irregularly ag- 

 gregated, dense ; yalyes with attenuated 

 apices. = Scltizojiema mesoqloeoides, ELA. 

 p. 103. Aberdeen. 1-600''. 



M. humile (K.). — Frond parasitic, yery 

 short, tufted, erect, subramose ; branches 

 with obtuse, hyaline empty apices ; 

 nayiculse acute, linear-lanceolate, ar- 

 ranged in two to four series. = Schizo- 

 nema humile, KB. p. Ill, pi. 23. f. 7. 

 Adriatic Sea. Nayiculae in front yiew 

 linear, truncate. 1-1200". 



M. papillosum (Me.). — Frond para- 

 sitic, small, yery mucous, gTeen; fila- 

 ments ultra-setaceous, subsimple or fur- 

 nished with acute spiniform ramuli, 

 eyerywhere covered with very minute, 

 regularly disposed papillre; valves nar- 

 row-elliptic, rather obtuse. = Scliizonema 

 p)apillosum, Me. p. 452. Dalmatia. Na- 

 viculcG in series, four times as long as 

 broad, in front view slightly elliptic, 

 with truncate ends. The papillnB appear 

 hemispherical or slightly conical, and 

 are arranged in quincimx. Me. 



M. Stalianum (Me., K.). — Fronds pa- 

 rasitic, gelatinous, green or greenish- 

 brown ; filaments setaceous, elongated, 

 irregularly branched; branches diverg- 

 ing, short; naviculse in series, six times 

 as long as broad ; valves elongated- 

 elliptic, obtuse. KA. p. 106. = Schizo- 

 nema Stalianum, Me. p. 452. Dalmatia. 

 Is very mucous and adheres strongly to 

 paper ; naviculse in front view exactly 

 linear. 1-420" to 1-360". 



M. Corinalili (Me.). — Frond parasitic, 

 small, green ; filaments subsimple, se- 

 taceous ; frustules minute, five times 

 as long as broad; valves narrow-ellip- 

 tic. = Schizonema Corinaldi, Me. p. 453. 

 Marseilles. Naviculae in series, in front 

 view exactly linear. The threads, slightly 



mucous, are usually simple ; the few ra- 

 mifications are short and divaricate, Me. 



M. fastigatum (K.). — Frond setaceous, 

 olivaceous, much branched ; ultimate 

 branches subcorymbose, ^^dth lanceolate- 

 acuminate apices ; naviculag minute, ob- 

 long, obtuse, in loose series. I'LV. p. 108. 

 Torquay. Secondary tubes obsolete. 



M. medusinum (K.). — Frond cartila- 

 gino-gelatinous, hyaline, brown, turgid 

 at the base, separated at the apex into 

 penicillate fibres ; series of naviculas 

 loosely entangled, intermixed with flex- 

 uose longitudinal fibres. KB. p. 118, 

 pi. 25. f. 6. = Scliizonema medusiniwi, Me. 

 Adriatic Sea. Valves lanceolate. 



M. liyalinum (K.). — Frond colourless, 

 hyaline, gelatino-cartilaginous, soft, seta- 

 ceous at base, much branched ; branches 

 attenuated, capillary, empty at the apex ; 

 series of na^dculge few, loose, inteimixed 

 with a few fibres ; naviculae minute ; 

 valves oblong-lanceolate, obtuse. KB. 

 p. 117, pi. 24. f. Q.^= Scliizonema hyalinum, 

 Me. Adriatic Sea. Navicidse 1-960" to 

 1-780"; in front view truncate. 



M. tenellum (K.)- — Frond colourless, 

 hyaline, gelatino-cartilaginous, setaceous, 

 branched, subdichotomous ; branches 

 delicate and empty at the apex ; series 

 of slender na^dculae and internal tubes 

 distinct. I^. p. 117, pi. 24. f. 7. = Schi- 

 zonema tenellmn, Me. Adriatic Sea. 



M. Hyalopms (K.). — Frond colomless 

 and hyaline at the base, above greenish, 

 narrow, much branched; branches fas- 

 tigiate, subacute, full to the apices ; lower 

 series of naviculae lax, superior crowded ; 

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

 f. 6. = Schizone7na Hyalopus, Me. Adri- 

 atic and French Seas, Jersey. Internal 

 tubes obsolete; naviculae in front yiew 

 oblong, truncate ; spermatia immersed, 



M. laciniatum (Harvey). — Frond ro- 

 bust, setaceous below, incrassated above, 

 yery tender and gelatinous, cleft into 

 numerous tapering branches; na^dculae 

 very minute, in close files ; valves ellip- 

 tic-lanceolate, ohiu&e. = Scliizonema laci- 

 nicdum, Harv. Man. p. 210; SD. ii. p. 79, 

 pi. 59. f. 371 ; S. sco^mrium, KB. p. 114, 

 pi. 27. f. 7. Europe. Frond cleft above 

 into nimierous irregular jagged branches. 

 1-600". 



'^L ptarasiticwn (GrifF., K.). — Frond 

 gelatinous, capillary, tufted, much and 

 intricately branched from the base; 

 branches flexuose, with rounded axils; 

 frustules crowded in distinct files ; valves 

 lanceolate, acute. KB. p. 116, pi. 27. f. 2. 

 = Schizonema ^^^''('sitictwi, Harv. Man, 



