Observations on Phaeozoosporeae. 
BY 
T. JOHNSON, B.Sc., F.L.S. 
Professor of Botany in the Royal College of Science, Dublin. 
With Plate VIII. 
BSERVATIONS tending to lessen that large number 
V_/ of Phaeozoosporeae of which it can be said that the 
reproductive organs are unknown or only imperfectly known, 
must be of use, more especially if such observations help in 
the formation of a more natural system of classification of 
this group. In the following pages I propose to give the 
results of the investigation of several brown sea-weeds which 
the excellent opportunities for research at Plymouth enabled 
me to examine in considerable detail. 
i. Carpomitra Cabrerae Kiitz. 
This plant, added to the British Flora in 1833 by Miss 
Ball 1 , is one of the rarest of British sea-weeds. In the sum- 
mer of 1889 I was so fortunate as to obtain, by dredging, a 
scrap of the plant from which it was possible to make out 
the mode of growth of the thallus. 
Trichothallic grozvth. The tip of a branch of C. Cabrerae 
is occupied by a tuft of hairs quite visible to the naked eye 
(Fig. 1). Janczewski says, ‘ S’il est permis de faire quelque 
conjecture sur 1’accroissement d’une algue d’apres des echan- 
tillons d’herbier, nous indiquerons que le Sporochmts pedun - 
culatus et le Caipomitra Cabrerae nous ont paru vegeter d’une 
maniere analogue a l’accroissement du Cutleria multi jida V 
Examination of fresh material shows that Janczewski was, 
1 Miss Ball’s specimen, with the rest of her herbarium, is in the Herbarium of 
the Science and Art Museum, Dublin. 
2 Ed. de Janczewski, Mem. Sc. Nat. Cherbourg, xix. p. 109. 1875. 
[Annals of Botany, Vol. V. No. XVIII. April, 1891.] 
