32 
men of Avr. longicaulis Murray and Boodle has moniliform filaments 
measuring 30—70 » in diameter which is M. A. Howe's definition 
of Avr. nigricans Decsn. It certainly is not Avr. Rawsoni M. Å. 
Howe.” 
Avrainvillea Mazei Murray and Boodle. 
Murray and L. A. Boodle, Å systematic and structural 
account of the genus Avrainvillea Decsne (Journal of Botany, vol. 27, 
1889, p. 70, tab. 288, fig. 6). Avr. longicaulis Howe, Phycological 
Studies — III. Further Notes on Halimeda and Avrainvillea (1. c. 
p. 509). 
Howe has called this species Avrainvillea longicaulis (Kiitz.) 
Murr. & Boodle, as he considers the Råipilia longicaulis of Kitzing 
(Tabulae phycologicae Band VIII, p. 13, pl. 28, fig. 2) as being this 
species and "which may be fairly considered the type” of the new 
”binomial” (1. c.). He has also (Phycological Studies — II, p. 586) 
examined fragments of Kiitzing's Rhipilia longicaulis in Herb. Sonder 
and has arrived at the opinion that this specimen is the same as 
the Avrainvillea Mazei even if some smaller disagreements are to 
be found. Had Howe now called this species Avr. longicaulis 
(Kutz.) Howe I might perhaps agree with him but in referring it 
to Murray's and Boodle's Avr. longicaulis, which, as Howe has 
pointed out, is to be considered as a mixture of Åvr. nigricans (the 
diagnosis) and /ongicaulis (the syn. Rhipilia longicaulis Kitz.) I can 
not follow him. Howe writes (1.c. p. 510) about the matter: "The 
maintenance of the binomial Avrainvillea longicaulis for the present 
species and the crediting of the name to Murray and Boodle 
are both, we believe, technically correct, even though it may prove 
a source of some confusion for a time, in as much as Murray 
and Boodle evidently intended that another species — the true 
A. nigricans Decaisne — should bear Kitzing's name /ongicaulis. 
But as Murray and Boodle, in proposing the new combination 
Avrainvillea longicaulis cited Kitzing's Rhipilia longicaulis it cannot 
be denied that this new combination applies also to Kitzing's 
species and that it applies to it in a peculiar and typical way.” 
