120 MES. A. WEBEE-VAN BOSSE ON THE 



togetlier, and cannot be separated without damage. The plant has distinct inflated 

 articulations blunt at both sides, and is certainly different from Champia comprcssa. It 

 strongly recalls Ch. parimla, especially the figure given by Kiitzing ia his Tab. Phyc, 

 Band xv. tab. 89, where CJi. parmda is figured under the name of Lomentaria intertexfa. 

 The plant from the Seychelles is, however, very small, having a height of only 1 cm., and 

 it is barren. . 



Chylocladia, Greville. 



1. Chylocladia perpusilla, n. sp. (Plate 12. figs. 4, 5.) 



I 



Tliallo minusculo, decumbentc, ramuloso, cavo, sine diaphragmate ; ramo pri- 



mario interne multis cellulis magnis ; ramulis constantibus e strato unico peripherico 

 cellularum magnarum et parvarum secundum quarum latus interne fila ramosa 

 decurrunt, nonnunquam glandulas ferentia. Sporangiis in ramulorum dilatatorum, 

 cavitatem prominentibus, nee in cavernis propriis sitis. Cystocarpiis et antheridiis 

 isrnotis. Thallo lato 0'5-0-6 m. 

 Saya de Malha, creeping on Udotea, 29 fms. 



This tiny plant was found creeping on TJdotea, though it did not appear to possess 

 rhizoids. It has a main axis, from which spring slender ramuli, sometimes opposite, but 

 mostly irregular ; the specimen is, however, so small that it is impossible to say much 

 as to its ramification. The main axis has a lenorth of 1 cm. and a breadth of 600 ju, the 



branches have a length of 2-5 mm. The branches are entirely hollow, but the down- 

 growing filaments that are proper to the genus bear glands (?) ; the main axis is filled 

 with large cells, loosely attached to one another. I could see no diaphra2tms, neither in 



the branches nor at the base of the branches ; the tetraspores are scattered over the 

 inflated top of some branches ; they protrude into the cavity of the branch, but they are 

 not situated in a special hollow, as they are in Lomentaria. 



On account of the position of the tetraspores and the absence of diaphragms, I believe 

 that this little plant belongs to the genus Chylocladia. Its small size characterizes it as 

 a new species. 



Cgelarthrum, Eorgesen. 



1. CfELARTHRLM (AlBERTISII ?) (Picc), Borg. 



" Some new or Httle-known West Indian Floridese, ii.,^' in Bot, Tidsskr. Bd. xxx. 1910, p. 189. 

 Lomentaria Albertisii, Piccone, Alghe in " Crociera del Corsaro," 1884, p. 37. 



Amirante, 20 fms. ; dry specimen. 



Disftibulioii, Canary Islands ; Guadeloupe and Bermudas ; West Indies ; Malay 

 Archipelago. 



I think it very probable that the alga from Amirante is Coelarthrum Alhertisii, because 

 I found that species amongst the 'Siboga' material. I cannot deny, however, that 

 the specimen has smaller articulations than the type and that I did not see in my 



