14 



Oltmanns refers to the Siphonocladiales the four families of 

 marine alga?: Cladophoraceae, Siphonocladacese, Valoniacese, and 

 Dasycladacese. 



To the Fam. Cladophoracese besides Cladophora, Rhizodo- 

 niiim, Clwetomorpha etc. Oltmanns also refers, of genera found 

 in the West Indies, Anadijomene, Microdictyon, Boodlea and 

 Dictyosphseria. To the Fam. Siphonocladiaceas he reckons Sipho- 

 nocladus, Struvea and Chajnsedoris, and to the Fam. Valoniacese 

 Valon ia. 



On the other hand Wille, in his revision of the Chlorophy- 

 ceae in Engler and Peantl, »Die natiirlichen Pflanzenfamilien», 

 has only three of the above mentioned families, namely: Clado- 

 phoracese, Valoniacese, and Dasycladacese. The Valoniacese are 

 divided into two groups: Valoniacex and Anadyomenese; to 

 the first mentioned is referred, of West Indian forms, Valonia, 

 Blastophysa, Siphonocladiis, Chamsedoris and Dictyosphseria', to 

 the last-mentioned Struvea, Boodlea, Microdictyon and Ana- 

 dyomene. 



In »Nachtrage zum 1. Teil«, 2. Abt. 1910—11, some altera- 

 tions are made, the Valoniacese comprehend here Valonia, Dic- 

 tyosphseria and Blastophysa, a new group Siphonocladese Sipho- 

 nocladiis and Chamsedoris and the group Anadyomenese Striwea, 

 Microdictyon, Anadyomene and Boodlea. Furthermore, the genus 

 Cladophoropsis founded and separated by me from Siphono- 

 cladus is referred in accordance with my earlier view to Clado- 

 phoracese. 



Of these two rather different groupings I mostly prefer 

 that of Wille. I do not think that some of the genera referred 

 to the Cladophoracese by Oltmanns can be registered there in 

 a natural way and my observations on my West Indian material 

 also tell against it. 



According to my investigations I think that the forms in 

 question can be divided in the following way: Cladophoracese, 

 to which I refer the same genera as Wille with exception of 

 Cladophoropsis, and Fa?0Azmce«, which I divide into four subfamilies, 

 namely, Anadyomenese, Valoniese, Boodlese and Struvese; these 

 four groups could perhaps quite as well be considered separate 

 families and Wille also points this out for his subdivisions. 



To the Subfam. Anadyomenese I refer, of the West Indian 

 forms, Microdictyon and Anadyomene. So far as I have been 

 able to see the cell division takes place here nearly in the same 

 way as in Cladophoracese and lentiform cells do not occur. Ball 



