BLASTOCLA D I ALES 



135 



2. AUomyces Butler (1911: 1027). 



syn. Septocladia Coker & Grant (1922: 180). 

 The thallus is differentiated into a stout basal portion and 

 slender branches. The former is attached to the substratum 



Fig. 51. — Blastocladia pringsheimii Reinsch. (a) Single large plant showing 

 portion of rhizoid system ; branches bearing sporangia and young resting spores. 

 (6) Smaller plant bearing spherical resting spores, (c) Resting spores, (d) 

 Swarmspore. (e) Optical section of wall of resting spore. (.After Thaxter 1896.) 



by rhizoids. The branches are separated into definite seg- 

 ments by pseudosepta, and are sometimes constricted at the 

 septa (Fig. 50). The pseudosepta, at least in early stages, are 

 perforated, so that the protoplasm of adjacent segments is 

 continuous. The branching of the thallus is dichotomous to 

 sympodial. The sporangium is provided with a varying number 



