Ann, Sci. nat. XVIII i on the ground thal he ha eeded in cuttin parallel 



itudinal is of o!i<- and the same filament, and that bj microscopical examinadon he 



ilutely "I the presence ol septa in the middle section, 

 ring only in the filaments ol the capitulum. Harvey being of the same opinion ;is 

 the filaments .is articulated, pluricellular and confervoid, and places the 

 genus in Valon Boi Amer. III. 1857, P- H' fhat Kützing's view is correcl is 



:adily proved b) the use ol a modern microscope. 

 Returning to the year i' s 4- we note the preliminarj diagnosis ol Montagne's new 

 1 Prodrom. Phyc. Antarct. p. 14. which in 1845 was described in full and 

 D'Urville's Voyage au Pole Sud, Bot, vol. I p. 25, pi. 1 1 fig 1 Montagne 

 1 long description of the structure of the plant. He describes the "crampons" and 

 the adhesion of the stipes-filaments is caused by these and not, as Lamouroux thought, by 

 elatinous matter which in drying glues together the paris where it predominates. 



ro return once more to 1842. In that year Decaisne published his Mémoire sur les 

 illines, in Ann. Sci. Nat. 2' sér. torn. XVIII. [842, where on pp. to8 — 11 1 he gives an 

 int of Penicillus, including eight species in the genus. He divides them into two sections, 

 in the first of which he puts five species, and in the second, under the heading "Articuli 

 "flabellato-coaliti", he places the two species which now constitute the genus Rhipocephalus\ 

 luit oddly enough he includes P. pyramidalis in the same group, — an obvious error which 

 is probably due to the misplacement of the above-mentioned heading; for clearly it ought to 

 have heen placed aft er. instead of before, P. pyramidalis. 



In 1 S 4 ; Kützing (Linnaea XY1I p. 95: and Phyc. gen. p. 310, tab. 43, III.) invented 



another new name for the genus, Corallocephalus, and included in it three species only, 



viz: C. Penicillus, C. Oedipus (= P. Pyramidalis) and C. Peniculum (= Chamaedoris annulata). 



The stem-structure is well figured and the continuity of the tubes at the constrictions is shewn. 



for the lirst time Penicillus Phoenix is separated off into a new genus Rhipocephalus. 



1 ndlicher (Genera Plantarum Suppl. III. 1843, P- [ 8) follows Dei usne in his division 



of the genus ITie first division, to which he gives the name Haligraphium, contains I >i > visne's 



with the addition of /'. arbuscula Montagne. The second division is called Hali- 



ma and, as in Decaisne's arrangement, includes P. pyramidalis as well as P. oblongus and 



/'. Phoenix. Endlicher failed to recognise that /'. pyramidalis had slipped into the wrong group. 



In Kützing (Spec. Algarum pp. 505,506) again describes Corallocephalus, this time 



with eight species: — C. Penicillus, C. elongatus, C. pyramidalis \ C. dumetosus, C. Lamourouxii, 



rranulosus, C. arbuscula and C. eriophorus. 



In 1857 Harvey (Nereis Hor -Amer. III. pp. 44 — -46) indicates his opinion that Rhipo- 



■ du not to be separated off from Penicillus and he adopts in place of it Endlicher's 



Halipsygma. He regards the species as variable and limits them to three — /'. 



/'. capita lus and /'. Phoenix. His views on the septate character of the filaments 



of the capitulum have hein mentioned above. 



In WoRONiNi (in Ann. Sci. Nat. 4 1 sér. XVI. [862 pp. 208- — 211) demonstrates 



thal hut a state of Penicillus. 



