638 
wliole of thè Floridece, and before he can exclude thè Bangiaceoe 
because of their want of conformity to thè theory, it will be neces- 
sary to explain thè apparently anomalous condition of N. versicolor )), 
Nowhere in my paper do I state or suggest, as Schmitz implies, 
that he relied solely on thè difference in thè nature of thè thallus 
as a reason for his exclusion of thè Bangiacese from thè Florideae. 
On p. 158 I say « so far does Schmitz apply his view that be excludes 
thè group Bangiaceae from thè Rhodophycece (Florideae), parili) 
because their thallus does not conform in its mode of development, 
to that of thè rest of thè Florideae». Again on p. 159 1 say «thè 
mode of formation of thè callosity does not agree with Schmitz ’s 
views as to thè structure of thè Floridean thallus. This, as far as it 
goeSy favours thè retention of thè Bangiaceae Jn thè Florideae». I was 
concerned with a consideration of thè nature of thè thallus only, and, 
as I supposed, safeguarded myself from misapprehension by thè qua- 
lifying words I bave quoted. 
I bave never been able to accept as satisfactory Schmitz 's rea- 
sons for thè exclusion of thè Bangiaceae from thè Florideae and pro- 
pose to follow hirn point by point in thè restatement he makes, of 
his views on thè systeniatic position of thè Bangiaceie. 
1. The thallus. — Schmitz has since 1883 become aware of a 
number of exceptions to his theory of thallus construction and uow 
States that thè mode of growth of thè thallus of thè Bangiaceae, by 
intercalari) divisions, is now relatively not so important a reason 
for his exclusion of thè group from thè Florideae (ein Grand ‘) von 
verhàltnissmassig geringerer Bedeutung). 
Its importance appears to me further lessened, a. by a know- 
ledge that there is often an actively dividing apical celi at thè tip 
of thè thallus of thè Bangiaceous genus Porphyra ’) (sometiraes 
also on thè margins of thè thallus). 
b. By a comparison with thè Brown Algae, thè Pheeophycece, In this 
sub-class there is great diversity in thè mode of growth of thè thal- 
lus. In some groups thè growth is marginai throughout life, in some 
intercalary (localised or generai), in others growth by an apical 
op. cit. p. 4. 
2) Until thè sliell-perforating genus Conchocelis, Batt. recently discovered, 
is delinitely placed in thè Bangiaceas, it would be out of place to disciiss thè 
nature of its thallus. 
G. Berthold: Die Bangiaceen p. 3. 
