876 



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



Frons usque ad 22 cm longa, e callo parvo, discoideo adsur- 

 gens, caule ad basin tenuiori, mox crassiori, terete, cylindrico, 

 ca. IV« — 2 mm crasso, carnoso, exsiccatione collapso. 



Rami sparsi, irregulariter undique 

 orti, ad basin tenuiores, celeriter cras- 

 siores, teretes, cylindrici, apice late 

 rotundati. Rami sæpe simplices, inter- 

 dum ramosi, ramulos parvos in superi- 

 ori parte gereutes. 



Tetrasporangia sparsa, in cortice im- 

 mersa. Cystocarpia verrucosa in super- 

 ficie plantæ sparsa. 



After renewed examination and after 

 having seen a specimen of Gracilaria 

 Blodgettii Harv. it is evident to me that 

 the plant, to which 1 previously have 

 given this name, cannot be referred to 

 this species, but must be regarded as a 

 new species for which 1 propose the name 

 Gr. cylindrical referring to the nearly cy- 

 lindrical thallus, which is only interrup- 

 ted by the narrowings at the base of the 

 branches (Fig. 364). 



The plant reaches a height of about 

 22 cm. It is fastened to the substratum 

 by means of a small disc. The main 

 stem, being quite thin at its outgrowth 

 from the disc, soon reaches the normal 

 thickness of the thallus, about I'/s — 2 

 mm and this thickness it keeps through- 

 out. The branches are issued on all sides. 

 The ramification is rather irregular with 

 shorter or longer distance between the 

 branches. 



These are altogether a replica of 

 the main stem. At their outgrowth 

 from this they are quite thin, but rapidly obtain the normal 

 size of the thallus keeping this through their whole length 

 (often more than 10 cm) to their obtuse apex. The branches 

 are mostly unbranched, but now and then they issue a 



Fig. 364. Gracilaria 



cylindrica nov. spec. 



Habit of a plant. 



(About Vs natural size) 



