54 
NEW OR CRITICAL BRITISH ALOLE. 
Delesseria ( Caloglossa, Harv.) amboinensis, a new fresh water 
Floridean. — M. G. Karsten (Botan. Zeitung, 1891, pp. 265-271, 
t. v.) describes a new fresh water species of Delesseria from 
Amboyna, collected at more than 100 feet above the level of the 
sea. This species closely resembles the brackish water species, 
D. mnioides and D. Leprieurii, Mont., species which M. P. 
Hariot points out (Bullet, de la Soc. Bot. de France, Revue 
Bibliographique, p. 18) are found at West Point, more than sixty 
miles from the mouth of the Hudson, a fact which makes M. 
Hariot suggest that perhaps the new species is only a form of the 
latter species more completely adapted for an existence in fresh 
water. 
Phceophycece ( Fucoidece ). By M. F. R. Kjellman (Engler. et 
Prantl. Die Natuerlichen Pflanzenfamilien, fasc. 60, p. 176, 
et seq.) 
After having given a general account of the vegetative and re- 
productive organs of the group, Prof. Kjellman, following the 
classification of his “ Handbook of Scandinavian Marine Algse,” 
divides the Phseophyceae into two groups, according to whether the 
reproductive organs are developed in conceptacles, i.e., small 
roundish cavities sunk beneath the surface of the frond ( Cyclo- 
sporce), or by outgrowths from, or division of, the surface-cells of 
the thallus ( Phceosporece ). The former class contains the Fucaceae 
alone, while the latter is again sub-divided into the Zoogonicce and 
the Acinetce. In the Zoogonicce both unilocular and plurilocular 
sporangia contain a large number of reproductive bodies, which are 
ciliated and endowed with the power of motion. In the Acinetse, 
on the other hand, the unilocular sporangium contains a single 
motionless spore, while the organ (Antheridium) analogous to the 
plurilocular sporangium contains a number of small mobile bodies. 
A single family (Tilopteridacese) is included in this latter order, 
all the other Phseospores being included in the Zoogonicce. 
In their turn the Zoogonicce are divided into two groups, the one 
(Gynocratce) characterized by the zoospores issuing from the 
plurilocular sporangia, and which unite to form a zygospore, being 
of very unequal size, — the female zoospore being very much larger 
than the male, includes a single family ( Cutleriacece) ; the other 
( Isogonicce ), in which the zoospores uniting to form the zygote are 
of nearly equal size, includes the following families : Ectocarpacece, 
Myriotrichacece , Choristocarpacece, Spliacelariacece , Encceliacece , 
Striacriacece, Desmarestiacece , Dictyosiphonacece, Elachistacece , 
Chordariacece , Stilophoracece , Spermatochnacece, Ralfsiacece, 
Laminariacece and Lithodermatacece. 
In the present part Prof. Kjellman deals with the two families 
Ectocarpacece and Choristocarpacece. In the former the growth is 
by intercalary cell division, while in the latter it is apical. The 
characters by which the genera into which the Ectocarpacece are 
divided are taken either from the position of the plurilocular 
