788 Thomas. — Notes on Cephaleuros. 
glycerine jelly preparations, the slides do not show the characters described 
by the investigator of Mycoideci parasitica with the clearness which, 
doubtless, they originally possessed. 
Primary discs closely resembling the a Ceylon form were seen/although 
the structure was somewhat obscure. The slide described as ‘ sub-epidermal 
discs with young oospores 5 was not unlike a preparation of the thallus 
zoosporangia seen in the Barbadoes material, and the aerial reproductive 
filaments were plentifully present. 
A slide of the ‘ epidermis of a Camellia leaf, showing mature 
oospores from below ’, showed rounded bodies with spherical cell-contents, 
and attached to them laterally an elongated cell. This is unlike anything 
observed in my material : the adherent cell is what was described by 
Cunningham as a pollinodium. 
Barbadoes Material. 
The position of this Alga is intracuticular, and hence is in direct 
contrast to that of the Ceylon forms. 
No early stages of this Alga have been observed in the material 
sent by Mr. Nowell ; and only mature plants were found, all occurring 
on the upper surface of the leaf. 
The Alga is roughly circular, the patches having a diameter of 
2*5 to 6 mm. 
Examination of material cut tangentially to the surface shows a 
radiating structure, roughly circular in outline, but the circumference of the 
circle is much more irregular than in the type a Ceylon ; the discs are more 
loosely made, and tend to break up to form radiating filaments. The 
individual cells here are much larger, being approximately 42/xXioto 1 2 /x 
when measured in surface view. 
Growth is marginal and takes place in the following way. The 
marginal cells enlarge and begin to divide by means of a cell-plate which 
grows inwards from the periphery. At first the direction of growth is 
parallel to the lateral walls of the parent cell ; but after a certain point the 
direction changes, and the new septum approaches and joins one of these 
lateral walls, curving in such a way that it meets the latter at approximately 
a right angle. A transverse septum may now be formed, joining the new 
median wall to the other lateral wall of the parent cell ; this second septum 
cuts both walls perpendicularly. The curved and straight transverse septa 
are a striking feature of the thallus (Figs. 10 and 11). 
Marshall Ward notes that in the Alga he investigated ‘ the tendency of 
the new walls to abut on the old ones at angles approaching the vertical is 
remarkable He describes the growth as being the result of dichotomous 
division of the marginal cells, although his figures resemble the appearance 
in this case (cp. Fig. 10 with Fig. 39 in his monograph). 
