186 Rhodora [AucusT 
mersed; where they grow on rock or woodwork in a station left bare 
for an hour or two at low tide, the tufts are dense enough to retain 
moisture until the tide returns; under these conditions the spores 
are not needed. 
Some five years since the writer published a note on Acrochaete and 
Chantransia, treating our species according to the classification of 
Bornet,* in which species with sexual fructification are referred to 
Chantransia, those with asexual fructification only to Acrochaetium. 
Since that time considerable attention has been given to this group, 
and sexual organs have been found in species heretofore supposed 
to lack them. Kyliné and Rosenvinge,* whose papers are specially 
important, include all under Chantransia, and it is probable that this 
treatment will be generally adopted. In conformity with this changes 
should be made in the names given by the writer in the paper above 
mentioned, and also in a later note ? as follows: — 
Chantransia Dasyae nov. comb. Acrochaetium Dasyae Collins, 
Ruopora, Vol. VIII, p. 191; P. B.-A., No. 1342. 
C. flexuosa (Vickers) nov. comb. Acrochaetium flexuosum Vickers, 
Ann. Sci. Nat., Ser. 9, Bot., Vol. I, p. 60. P. B.-A., No. 1696. 
C. Dictyotae nov. comb. Acrochaetium Dictyotae Collins, RHo- 
DORA, Vol. VIII, p. 193, P. B.-A., No. 1394. 
C. minima nov. comb. Acrochaetium minimum Collins, RHODORA, 
Vol. X, p. 133. P. B.-A., No. 1493. 
C. Hoytii nov. comb. Acrochaetium Hoytii Collins, RHODORA, 
Vol. X, p. 134. P. B.-A:, No. 1540. 
Among the material collected by Dr. Hoyt another species of 
Chantransia occurs, which seems to be identical with a Mediterra- 
nean plant long since distributed in Erb. Crit. Ital., under the name 
of an Atlantic coast species, Callithamnion Lenormandi Suhr; though 
Bornet? notes that the two are distinct he does not propose a new 
name; it may now be called 
1 Collins, Acrochaetium and Chantransia in North America. Ruopora, Vol. 
VIII, p. 189, 1906. , 
? Bornet, Deux Chantransia corymbifera Thuret. Acrochaetium et Chantransia. 
Bull. Soc. Bot. de France, Vol. LI, p. XIV, 1904. 
3 Kylin, Zur Kentniss einiger schwedischer Chantransia-Arten. Bot. Studier tillig- 
nade F. R. Kjellman, p. 113, Uppsala, 1906. 
Studien uber die Algflora der schwedischen Westküste; Akademische Abhand- 
lung, Upsala, 1907. 
4 Rosenvinge, The marine algae of Denmark, part I, Kgl. Danske Vidensk. Selsk. 
Skrifter, Ser. 7, Vol. VII, No. I, 1909. 
5 Collins, Two new species of Acrochaetium. Ruopora, Vol X, p. 133, 1908. 
$ Bornet, 1. c., p. XIX. 
