158 DR. HARVEY ON A COLLECTION OF ALGE 
eommunicated by him to the herbarium at Kew, have been placed 
in my hands for determination. In the subjoined descriptive 
eatalogue I have given the results of my examination, and shall 
merely preface the technical matter by a few general observations. 
The whole number of species ascertained is 107, of which 100 
are marine, and 7 freshwater species. The latter are as follows :— 
A Vaucheria (undeterminable). Conferva floccosa. 
Batrachospermum moniliforme. A Zygnema (undetermined). 
Cladophora glomerata. Hydrurus penicillatus. 
Conferva rivularis. 
All of these (including probably the undeterminable ones) are 
also British, and only one of them, Hydrurus penicillatus, is of 
local distribution. Dr. Lyall’s specimens of this plant are of 
small size; but at Santa Fé, in New Mexico, Mr. Fendler has 
collected it in great abundance and of gigantic size, his specimens 
being sometimes two feet in length. 
Of the 100 marine Alge, eleven are either new species or well- 
marked new.forms to which I have given specific names, namely 
these :— 
Agarum fimbriatum, H. Cystoclonium gracilarioides, H. 
Laminaria apoda, H. Callophyllis flabellulata, H. 
Ectocarpus oviger, H. Prionitis Lyallii, H. 
Rhodomela Lyallii, H. Schizymenia coccinea, H. 
Polysiphonia senticulosa, H. Callithamnion subulatum, H. 
Hymenena latissima, H. 
Of these the most remarkable is Laminaria apoda, which differs, 
as its name imports, from all other species of Laminaria in abso- 
lutely wanting a stipes. In other species, indeed, the stipes varies 
from less than half an inch to 12-15 feet in length; but in all 
cases a more or less obvious stipes interposes between the root and 
the lamina, and the new portion of frond grows between the 
apex of the stipes and the base of the lamina. In our L. apoda 
the stipes is represented by a basal callosity or thickening of the 
lamina, from which a fascicle of fibrous branching roots directly 
springs. Dr. Lyall has sent numerous specimens of various ages 
and sizes, and all have precisely similar characters; I do not doubt, 
therefore, that this is a well-marked and limited form. The nearest 
approach to L. apoda that I have seen occurs in some of the 
shorter-stemmed varieties of L. dermatodea; but I am not pos- 
sessed of any specimen which could be regarded as intermediate. 
T am not so confident of the distinctness of my Agarum fimbria- 
tum from A. pertusum. The fimbriated character is not a very Cer- 
