314 



Dansk Botanisk Arkiv, Bd. 3, Xr. 1. 



Pl 



Murrayella Schmilz. 



1. Murrayella periclados (Ag.) Schmitz. 

 Schmitz, Fr., Die Gattung Lophothalia J. Ag. in Berichte d. deutsch, 

 bot. Ges., Bd. XI, 1893, p. 227. Falkenberg, P., Rhodomelaceen, p. 563, 

 pl. 12, figs. 24—25. 



Hutchinsia periclados Ag., Spec. Alg., vol. II, p. 101. 

 Polysiphonia periclados Kütz., Species Alg., p. 822. 

 Bostrychia Tuomeyi Harv., Nereis Bor. Am., Part II, p. 58, .pl. XIV E. 

 ßostrychia periclados J. Ag., Spec. Alg., vol. II, pars III, p. 861. 

 Polysiphonia Binderi Sonder in Kützing, Tab. Phycologicæ, vol. XIV, 

 45 a, b. 

 Murrayella periclados is a common mangrove alga forming upon 

 the roots of the mangroves dark red-brown, densely felted cushions. 

 These consist of basal creeping fdaments from which the erect ones 

 grow up (Fig 318). 



The creeping filaments can be more or less destitute of branches, 

 but m most cases these are to be found even if they often are rather 

 scarce and for the most part not much developed. 

 The creeping filaments are fastened to the sub- 

 stratum by means of rhizoids (Figs. 318 and 319). 

 The rhizoids grow out near the ends of the 

 pericentral cells. They issue singly or often several 

 together from the same segment (Fig. 319). In this 

 case the rhizoids are mostly growii together at 

 their base, forming a bundle. Higher up the rhizoids 

 become gradually free, spreading in all directions. 

 These rhizoids remind one much of those found in 

 Bostrychia. The rhizoids are often branched ; they 

 have cross walls and rather long cylindrical cells, 

 about 3—5 times as long as broad ; they 

 are rather thick-walled, with stratified 

 walls, often penetrating a little into 

 the bark of the mangrove, the cells of 



which fre- 

 quently are 

 attached to 

 the rhizoids 

 after prepara- 

 tion 

 (Fig. 318). 



Fig. 318. Murrayella periclados (Ag.) 



Schmitz. Part of a plant. 



(About 8:1). 



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