260 TEXT-BOOK OF FUNGI 



Saprokgnia ferox causes the well-known salmon disease. 

 Empusa muscae, the fungus that destroys house-flies, was 

 at one time considered to be an aerial condition of S. 

 ferox ; it is now proved that the two are in no way related 

 to each other. 



Pythium debaryanum causes the damping off of seed- 

 lings of cress and other plants when sown in damp, dull 

 situations. Leptomitis lacteus is not uncommon in rivers 

 and streams, and often becomes a nuisance in places 

 where organic matter or refuse is emptied into a stream 

 from manufactories. It grows in long, dense tufts, re- 

 sembling loose strands of tow in appearance and colour. 

 Under the microscope it is at once recognised by the con- 

 strictions occurring at intervals in the hyphae, which are 

 branched. 



Distribution general. 



Brefeld, Bot. Unters. Schimmelpilze^ * Studies on various 

 Members of the Phycomycetes.' Vols. i, 4, 6, 9. 



Dangeard, ' Researches on Structure and Sexuality of 

 Polyphagus euglenaej Le Botaniste, i Aug. 1900. 



Engler and Prantl, 'Phycomycetes,' Pflanzenfam.^ i, i, 

 p. 63 (1892). 



Fischer, ' Phycomycetes,' Rabenh. Krypt. FL, Pilze, 4 

 (1892). 



Humphrey, ' The Saprolegniaceae of the United States,' 

 Trans. Amer. Phil. Soc., 1892. 



Massee, 'British Phycomycetes,' British Fungi, p. 71 

 (1891). 



Palla, 'Contrib. to Knowledge of the Genus Pilobolus* 

 Oesterr. Bot. Zeit. (1900). 



Saccardo, 'Phycomyceteae, ',&*<:<:. Syll., 6, i, p. 181 (1888). 



