88 Church. — The Polymorphy of 
Zanardini 1 , and Kiitzing, in his Species Algarum (1849). gives 
both Aglaozonia parvula for the English and Mediterranean 
plants, and Aglaozonia reptans for Crouan’s specimens. The 
sporangia and the emission and asexuality of the zoospores 
were correctly described by the brothers Crouan 2 , at Brest, 
in 1856, from the large quantities of material they found 
thrown up by a storm on April 5 of that year, while the first 
correct drawings were given by Zanardini 3 in 1 860. Since 
then the plants have been known as Aglaozonia reptans , it 
being clear that Crouan’s specimens were not only identical 
with those found elsewhere, but were the first on which 
the reproductive organs were definitely observed. 
The discs of Aglaozonia are perennial, and are distributed 
from the Mediterranean along the Atlantic shores of Western 
Europe to the coast of Norway, being much more abundant 
and more widely distributed than is Cutleria along the 
Norwegian coast 4 . Again, they are more general than 
Cutleria in the North Sea, and are found abundantly in the 
more northern portion (Berwick) where Cutleria is unknown ; 
and finally, they penetrate into the milder climate at the 
entrance of the Baltic, and are moderately common in 
the Skagerack 5 , where Ctitleria is very rare, or only found 
as very young specimens. Aglaozonia reproduces in the 
Mediterranean in late autumn, in the Channel in early spring, 
and it would appear that Areschoug found his Swedish 
specimens in reproduction during the summer months. On 
March 29, 1897, shells bearing fine plants of Aglaozonia 
with reproductive sori were dredged in the river Yealm, 
Plymouth. One or two sori were carefully removed, placed 
in a glass dish of filtered water, and allowed to stand in 
a window exposed to a north light. Zoospores were set 
free in great numbers, and rising to the surface, swam 
towards the side nearest the light, forming in a day or two 
1 Saggio di classificazione nat. delle Ficee, 1843. 
2 Bull. Soc. Bot. de France, 1857. 8 Icon. Phycolog. Adriatica. 
4 Kjellmann, Handbok Skand. Hafsalgflora, 1890, p. 17. 
5 Gran, Algenvegetationen i Tonsbergfjorden. 
