65 
ON THE OCCURRENCE OF GALLS 
IN RHODYMENIA PALMATA Grev. 
By Erset Saret Barton. 
(Piare 803.) 
So little is known of pathological structures in Algw, especially 
the marine forms, that I venture to think some interest will be 
gi 
as it is popularly called. It has been recorded by Magnus (Com- 
mission zur wissensch. Unters. d. deutschen Meeres, vol. 2, p- 76), that 
Chytridium fumaectine agn., in species of Ceramium; C. sphacel- 
larum Kny, in Cladostephus spongiosus and Sphacelaria cirrhosa ; and 
the so-called “ Vaucheria-galls” These were de- 
scribed and figured by Vaucher (Confer Be eau | douce, t. iii. fig. 8), 
so long ago as 1803, and numerous observers have since his time 
added to our knowledge, or at all ae to the literature, of the 
ec notably Balbiani, who has given a beautifully illustrated 
account of them in the Annales des Sciences Naturelles ar ag 
6 sér. are vii. 1878. It may be mentioned that Mr. A. 
Bennett, in a short edge on this subject (Annals of Botany, vol. a 
Pp: sles a ee tees s the literature and furnishes us with fresh 
* cu wih the parasite has entered at an early stage, 
prevented it from forming oogones | antherids, and caused it to 
swell to from four to five times its original size by sete 
is rv _— probably by the actin of a stimulating seeretio: 
as in 
With, the exception of the above cases I know of no other mal- 
formation in Alge except a state of Ascuphylium nodosum shown me 
by Mr. George ey of which I hope to be able to give an account 
at another tim 
hether the formations I am going to describe are to be cor- 
rectly termed ‘‘ galls”” I may not definitely say, but they are cer- 
tainly outgrowths of tissue produced by the presence and operations 
of an animal Eee or it may be by the stimulation of a specific 
animal secretion 
ignorance “of a better word, if there be one, I shall call 
them calla and at least they have a better claim to the title than 
the malformation so-called in Vaucheria. 
Vhile i. Me. Go 
Murray and I collected several pig plants, on which 
numerous minute papilla were observ These in all cases 
on mature plants, side with the ohjeot of oa ace. Se 
the i aaa I made a number of examinations of them. They 
at first baffled my curiosity in this respect, and though 
Dr. poe: at this stage of my work suggested (as the result of his 
JournaL or Borany.—You. 29. §=[Marca, 1891.] F 
