88 THE FHYCOMYCETES 



FiTZPATRicK, H. M., The lower fungi: Phyco??iycetes. 331 pp. McGraw- 

 Hill, New York. 1930. 

 Lagerheim, G., "AUxologische Studien II. Untersuchungen iiber die 



Monoblepharideen," Beibang t. K. Svensk. Vet. Akad. Handl., 25: Afd. 



Ill (8): 3-^2, 1900. 

 Laibach, F., "Zytologische Untersuchungen iiber die Monoblepharideen," 



Jahrb. iviss.' Botan., 66: 596-630, 1927. 

 Shanor, L., "A new Monoblepharella from Mexico," MycoL, 34: 1'M-l^l, 



1942. 

 Sparrow, F. K., Jr., "The Monoblepharidales," Ann. Botany, -^7: 517-542, 



1933. 

 '''Monoblepbaris taylori, a remarkable soil fungus from Trinidad," MycoL, 



57:737-738, 1939. 

 "Aquatic Phycomycetes recovered from soil samples collected by W. R. 



Taylor on the Allan Hancock 1939 Expedition," Allan Hancock Pacific 



Exped., 5:101-113, 1940. 

 Thaxter, R., "New or peculiar aquatic fungi. I. xMonoblepharis," Botan. 



Gaz., 20:433-440, 1895. 

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477^85, 1895. 

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St. Petersburg (Phys. Math. CI.), i 5: 1-24, 1904. 



LEPTOMITALES 



The group Leptomitales is one of the smaller orders of 

 aquatic fungi, including 7 genera and approximately 20 species. 

 Throughout the group the zoospores are biciliate, and the cell 

 walls are invariably composed of cellulose. The group differs 

 from the Saprolegniales chiefly in the constriction of the hyphae 

 to form a chain of segments. Large granules of cellulin, a carbo- 

 hydrate related to cellulose, occur within the hvphae near the 

 constrictions and may form plugs resembling septa. 



There is a great diversity of form among the various genera. 

 Some workers, including Indoh (1939), recognize two distinct 

 groups: (1) a "filamentous" group, including Leptomiras and 

 Apodachlya, and (2) an "arbusculate" group, including Sapro- 

 myces, Araiospora, and Rhipidium. The appearance of the ar- 

 busculate forms, with their basal cell crivino- off numerous slender 

 branches above, is reminiscent of the Blastocladiales, with which 

 they are frequently found associated in nature. 



The usual method of collection [Kanouse (1925)] is to leave 

 a "bait" of fruit or twigs in the water for some time. The group 

 has been little studied and appears to be of rather infrequent oc- 



