the other with five flabella. It follows from this that the plant is 
rather polymorph. 
In the Bulletin of the Torrey Botanical Club, vol. 32, 1905, 
p. 569 Howe has described a new genus Cladocephalus represented 
by one species viz. Cl. scoparius. As to the related forms of this 
genus Howe writes as follows: “The genus Cladocephalus, though 
having a slight superficial resemblance to Penicillus in habit and 
form, is most nearly allied to Avrainvillea, being in some respects 
intermediate between that genus and Udotea. It differs from both 
genera in having a thamnioid or scopiform capitulum instead of a 
flabellum.’’ Having examined specimens of this plant, of which 
Howe has most kindly sent specimens of his type No. 4079, 
I have found that Cladocephalus scoparius as to its anatomy 
competely agrees with my plant and with Flabellaria luteofusca 
Crouan at all events with Nr. 1405. It is therefore the habitus of 
the plant oniy which could maintain the generic difference of 
Howe’s plant from Crouan’s and mine, and the question arises 
if this really is justified. Ultimately this question may of 
course be settled by investigations in nature itseif, to decide 
about this finally my material is too scanty. But referring to 
Howe’s figure as well as to original specimens, it seems to me 
very probable that Howe’s plant is only to be considered as a form 
developed under peculiar, most probably unfavourable external 
conditions of life. Howe writes namely as to the growing-place for 
his type No. 4079: “Rare and local in the Bahama Islands, on sandy 
or muddy bottom in 2—10 dm. of water (low-tide).” And further, 
he adds: “Besides the single speeimen collected on the shores 
of New Providence, we have thus far met with this remarkable 
plant on only one occasion, when several hundreds were growing 
associated with two species of Penicillus in a small area in an 
inland pond which had been connected with the sea by an artificial 
canal.” Ponds like these often occur also in the Danish West 
Indies, where the water is shallow, often dirty, and cloudy and 
more or less brackish. In such localities the alge are often seen 
