I9I4- RiDDEi«SDKi.iv. — The British Forms of Hclosciadiiim . loi 
generic name, so that the responsibihty for the arrange- 
ment may in both cases be traced to the right quarter. 
Apium nodiflorum, Reichh. fil. 
f. vulgare. 
/, ochreatum. 
/. pseudo-repens. 
var. longipeduncuJatum, F. Schultz. 
f. simulans. 
A. repens, Reichh. 
X A. Moorei, Riddelsdell. 
f. subnodiflorum. 
/. subinimdatum. 
A. inundatiim, Reichb. fil. 
var. fluitans, Fr. 
Old Registry, Llandafif. 
REVIEW. 
BLUE-GREEN ALGAE. 
Notes on the Blue-Green Algae. With a key to the species of Oscillatoria 
and Phormidium. By Harold Wager, F.R.S. Pp. 48. London, 
Hull, and York : A. Brown & Sons, 1914. Price, 2s. 6d. 
Students of this interesting group of algae have placed before them a 
useful guide by the publication of the " Notes " by H. Wager, whose 
cytological work on the group is well known. As the guide is mainly 
intended to aid the preliminary identification of the species of the two 
genera Oscillatoria and Phormidium it may seem out of place to regret 
the omission, from the account given of the life -history of the group, of 
the movements of Oscillatoria, etc, of the ecological features of the 
group {e.g. that O tenuis, var. nutans, is at first a member of the 
benthos and later of the plankton) ; and of the economic importance 
of the group {e.g., relation to drinking water). The price (25. 6d.) seems 
high for a book of 48 pages, without illustrations even, to students to 
whom the larger illustrated works quoted are not available. Gomont's 
Monograph is twice mentioned without the accent in Oscillariees, one of 
few errors in an otherwise well -produced key. 
Ireland is a most promising and neglected field for the study of the forms 
described in this encouraging book. 
T. J. 
