612 Eumycetes. 



the uniflagellated and the two-flagellated — as indicated by Lotsy 

 and Vuillemin, the author assent to the point of view of de 

 Bary, thinking that the Chytridineae on the whole should be derived 

 from higher Phycomycetes or Algae, and he does not agree with 

 Dangeard and A. Fischer, who suppose the Chytridineae to de- 

 scend from the Monadineae. The author is sceptical as to the emi- 

 nently systematical importance of the number of the fiagella; he 

 admits that this difference indicates two series of Phycomycetes, 

 but he considers these as closely related to each other, having re- 

 lated ancestors. The power of the zoospore forming a mycelial 

 membrane is a very important matter, which mainly separates the 

 Monadineae from the Chrytridineae. The zoospore in the uniflagellated 

 Chrytridineae as in the twoflagellated ones is often found to form a 

 little mycelium for instance in Phlyctochytrium and in Diplophlyctis. 

 The formation of Channels for the zoospores can be looked upon as 

 a trace of a mycelium. Zygorhisidium forms a little mycelium in 

 the sexual tubes. Further there is hardly so deep a cleft between 

 rhizoids and mycelium. The transition between these parts is par- 

 ticularly imperceptible in Siphcnaria variabilis. The manner of en- 

 trance of the zoospore leaving a „Cystenhaut", in connection with 

 the said tendency to formation of mycelium, rather implies a rela- 

 tionship to myceliated ancestors than to the Monadineae where my- 

 celium is unknown. 



Many of the author's biological remarks are of general interest 

 and must be mentioned here. The hyphae-bearing submerse Phy- 

 comycetes may occur in all localities where the water is tran- 

 quil, not containing much ferrid oxide and not of short duration. 

 The substrata mostly used are branches of several trees. Their gro- 

 wing must be checked by dense Vegetation or by certain lower 

 animals for inst, by larvae of Phryganeae. They generally winter by 

 their spores but the author has several times found living mycelium 

 and gemmae of Saprolegniaceae in the frostless periods, what indi- 

 cates that these fungi can winter in a vegetative stage. The fructi- 

 fication of Achlya racemosa only takes place in the months of March 

 to May during which time the water is still cold. 



The 70 species, found in Den mark by the author, are separately 

 mentioned. A new genus is proposed: Pythiomorpha: Mycelium ra- 

 mosum, membrana chlor.zinc.jodato rubro-violaceo colorata. Propa- 

 gatio adhuc cognita zoosporis duobus ciliis lateralibus munitis vesica 

 non cinctis exeuntibus efficitur; of the family Pythiomorphaceae. 12 

 new species are described in Latin and deliniated: Saprolegnia semi- 

 dioeca, S. paradoxa, Achlya decorata, Aphanomyces coniger, Pythio- 

 morpha gonapodyoides, Pythium Daphnidarum , P. nndidatum , Myso- 

 cytium irreguläre, Olpidiopsis echinata, Phlyctochytrium stellatum, 

 Rhisophidium septocarpoides, Pleotrachelus Wildemani. 



' J. Lind (Copenhagen). 



Seaver, F. J., Discomycetes of North Dakota. (Mycologia. I. 

 p. 104—114. 1909.) 



Brief notes are given for thirty-four genera and forty-seven 

 species of Discomycetes of the groups: Helvellineae , Pesisineae, 

 Phacidineae , and Hysterineae. R. J. Pool. 



Seaver, F. J., Studies in Pyrophilous Fungi. I. The occur- 



