9' 



Species i n q u i r e n d a. 



" Penicillus} comosus Crouan in Schramm et Mazé Algues de la Guadeloupe ed. I. 

 "[1865] p. 44, n. 158. - - Griseo-viridis ; stipite brevi, cylindraceo, incrustato, filamentis nume- 

 "rosis, laxe anastomosantibus, superne in comam subplanam, flabelliformem, intertextam, mar- 

 "gine laciniatam abeuntibus constituto. 



"Hab. ad insulam Guadelupam (Mazé). - In editione ejusdem operis altera ne memo- 

 "ratus quidem". 



This diagnosis is copied from De Toni's Sylloge Algarum I. p. 503 (1889). We have 

 never been able to see Schramm and Mazé's first edition, nor have we seen any named specimen 

 of the plant. Were it not for the word "anastomosantibus", we should be inclined to refer it 

 to Udotea conglutinata or U. cyathiformis. 



12. Rhipocephalus Kützing. 



(Figs. 183—192). 



H is tor ie al. 



The history of the genus RJiipocepliahts is closely bound up with that of Penicillus, 

 from which genus it was separated in 1843. The oldest specimen of which we have cogni- 

 sance is in the British Museum (see p. 97) and belonged to Samuel Dale who died in 1739. 

 The first of the species mentioned in literature appeared under the name of Corallina Phoenix 

 described by Ellis and Solander in their Nat. Hist. Zoophyt. 1786 p. 126. tab. 25. figs. 2, 

 3, where it is placed with C. Penicillus, as we relate in our account of the genus Penicillus 

 (p. 68). It then follows the fortunes of Corallina Penicillus {Penicillus capitafus) through 

 the phases of Ncsaea and Penicillus till Kützing (Phycologia generalis 1843 p. 311), sepa- 

 rated it off to form his new genus Rhipocephalus. From that time Rhipocephalus has main- 

 tained its position except at the hands of Mazé and Schramm (Algues de la Guadeloupe p. 87) 

 who call their plant Udotea Phoenix, and of Harvey (Ner. Bor.-Amer. III. 1858. p. 46) who 

 was clearly of opinion that R. Phoenix should not be separated from Penicillus (see under 

 Penicillus p. 70 supra). 



The second species of the genus was created by Decaisne (Mém. sur les Corall. in 

 Ann. Sci. Nat. XVIII. 1842. p. 109), under the name of Penicillus oölougzis and was placed 

 with P. phoenix and P. pyramidalis in a subdivision of Penicillus (see p. 70). In 1843 

 Kützing removed it with /'. phoenix to Rhipocephalus. No other species has ever been added 

 to the genus. 



M orph ological. 



Extern al characters. The thallus of Rhipocephalus broadly resembles that of 

 I J c)iicillus in habit and structure. It consists of root-mass, stipes and capitulum. The stipes is 

 ahvays simple, terete, firm and calcified, and may be short or long. The capitulum varies very 

 much in shape from ovoid to cylindric, and in size up to 10 cm. long. It is composed of 



