8 7 
Cutleria multifida ( Grev .). 
Not only were the Plymouth plants truly parthenogenetic, 
as opposed to Falkenberg’s truly fertilized ones, but they 
were grown in the autumn months, whereas Falkenberg’s 
were grown in the spring ; the only factor in common 
therefore appears to be this, that in either case the spores 
were obtained from mature plants about to die, from summer- 
heat in the latter case, but from winter-cold in the former. 
Germination of Zoospores of Aglaozonia. 
Aglaozonia plants were first described by Greville 1 in 1828, 
from specimens found, appropriately enough, by Miss Cutler 
at Sidmouth, growing at low-tide mark on exposed sand- 
stone rocks ; these sterile plants being placed as a new 
species in the genus Zonaria of C. Agardh under the name 
Zonaria parvula . Later Greville 2 founded a new genus, 
and changed the name to Padina parvula ; and in 1833 
similar sterile plants found by Crouan 3 at Brest were dis- 
tinguished as Padina rep tans. Reproductive organs were 
first found on Skagerack specimens by Areschoug in 1843, 
and the genus refounded as Padinella. Areschoug’s plants 
were very small, and possibly dead before examination, as 
his figures 4 are quite misleading 5 . 
The genus Aglaozonia was ultimately established by 
1 Crypt. Flora, t. 360. 2 Alg. Brit. 1830, p. 63. 
3 Florule du Finisterre, p. 169. 4 Linnaea, 1843, p. 260. 
5 Areschoug obtained his plants on oyster-shells at Koster, and was satisfied 
that they were identical with Sidmouth specimens described by Greville. His 
drawing appears to have been made from a squeezed-out sorus, rather than from 
a section ; and the appearance which it presented induced Reinke to revive the 
old name of Zonaria parvula for a plant he obtained at Naples in 1875 (Nova 
Acta, xl, No. 1. p. 34), which was of distinctly Dictyotacean nature. Reinke’s 
plant differs fundamentally from Aglaozonia in the structure of the thallus, the 
well-marked ‘ tetraspore/ and, above all, in the embryology, which is again that of 
the Dictyotaceae. It is quite obvious that Greville’s Sidmouth plants were 
Aglaozonia , as they still grow there abundantly, and Areschoug had received 
specimens from that locality ; but it is not clear why Reinke’s distinctly Dictyotoid 
plants should be classed as Cutleriacean by De Toni (Sylloge Algarum, Fucoideae, 
p. 234). 
