Two Fungi, parasitic on species of Toly- 
pothrix (Resticularia nodosa, Dang, and 
R. Boodlei, n. sp.). 
BY 
F. E. FRITSCH, B.Sc., Ph.D., F.L.S. 
Demonstrator in Botany , University College, London . 
With Plate XXIX. 
HE researches of the last twenty years have shown that 
1 there are a considerable number of Fungi which infest 
algal hosts and generally cause considerable havoc amongst 
them. Lemmermann (’01) has recently enumerated 193 such 
forms, which belong chiefly to the Chytridineae and the 
Ancylistaceae. With a member of this latter order we are 
concerned in the present paper. 
The genus Resticularia was first established by Dangeard in 
1890 for a Fungus, parasitic in Lyngbya aestuarii. Since 
that time no further contribution towards our knowledge of 
the genus has, as far as I am aware, been published. Dan- 
geard’s genus has been accepted by Fischer (’ 92 , p. 84) and 
by Schroter (’ 93 , p. 92), both authors placing it next to the 
genus Ancylistes of Pfitzer. 
Dangeard’s Resticularia nodosa (Dangeard, ’ 90 ) assumes the 
form of a straight tube, which is frequently appreciably 
enlarged within each cell of the Alga, so that in its entirety 
[Annals of Botany, Vol. XVII. No. LXVIII. September, 1903.] 
Y y 2 
