622 SUMMARY OF CURRENT RESEARCHES RELATING TO 



Japanese Algae.* — K. Okamura publishes a further part of his 

 Icones of Japanese Algae, containing plates of Oryptonemia Schmitziana, 

 Desmarestia Ugulata, D. viridis, and D. latifrons. The structure of Des- 

 marestia is well figured, showing the corticating filaments of the stem. 



New Fossil Fucoid.f — A. Hollick describes and figures a specimen 

 found by him in the Museum of the New York Botanical Garden, under 

 the name of " Haliserites sp." It was collected at Franklin, Delaware 

 Co., X.Y. The author discusses the systematic position of this fossil, 

 as to whether it should be regarded as belonging to Haliserites or not, 

 and shows that it belongs to Thamnocladus. He gives a diagnosis of it 

 under the name of Thamnocladus passifrons. 



Mazza, A.— Saggio di Algologia Oceanica. (Marine algology.) 

 [A continuation of this author's work on marine algse ] 



Nuov. Notar., sari. (1910) pp G5-99, 125-52. 



Fungi. 



(By A. Lorrain Smith, F.L.S.) 



New Chytridiaceous Fungus.i — Olive Hood discovered the new 

 fungus in the colonies of Eudorina ehgans. The parasite was most 

 evident in the early autumn months, as the zoogonidia at that time 

 attack the Eudorina colonies ; the parasite (zoogonidium) becomes 

 attached to the gelatinous envelope of the Eudorina by the pointed end, 

 and gradually penetrates the cells of the interior where a new zoo<>onid- 

 angium is formed. The zoogonidia, when mature, escape into the 

 water, and increase in size before they attack a new host. The fungus 

 has been named Rhizophidium Eudorinse. 



Fresh-water Phycomycetes.§ — H. E. Petersen has studied these in 

 Denmark. He considers that the Chytridineae are derived from higher 

 Phycomycetes, or from algae, and he dissents from the view of Dangeard 

 and E. Fischer, that they descend from the Monadineaa. The forma- 

 tion of mycelium from the zoospore separates the Monadineas from the 

 Chvtridineae. 



Submersed Phycomycetes may be found in any tranquil water not 

 containing much ferric-oxide ; they attach themselves usually to branches 

 of trees, and may survive the winter in vegetative form, though it is 

 usually by the spores that they live through the cold period. The 

 author found seventy species in Denmark, twelve of these being new 

 to science. One new genus is described, Pithiomorpha. 



Cytology of Albugo Candida and Peronospora Ficariae. [| — Fritz 

 Kruger cites the work of recent writers on nuclear division in the 



* Icones of Japanese Algse, ii. No. 5 (1910) pis. 71-5. 

 t Bull. Torrey Bot. Club., xxxvii. (1910) pp. 305-7 (1 pi.). 

 X Proc. Birm. Nat. Hist. Soc, xii. (1910) pp. 38-45 (5 tigs.). 

 § Bot. Tidsskr., xxix. (1909) pp. 345-440 (28 figs.). See also Bot. Centralbl., 

 cxiii. (1910) pp. 611-12. 



|| Centralbl. Bakt., xxvii. (1910) pp. 186-205 (2 pis.). 



