476 AQUATIC PHYCOMYCETES 



diameter, with a thin brownish wall which wrinkles after discharge, 

 plasma colorless, rhizoidal system variable, delicate, bearing numerous 

 fusiform spherical and irregular swellings and occasionally septate 

 turbinate cells; zoospores spherical, 4.2 \i in diameter, with a centric 

 colorless globule and a single flagellum, escaping upon the dissolution 

 of an apical or subapical papilla into a broad flask-shaped vesicle in 

 which they swarm ; resting spores apparently terminal, on broad elements 

 of the rhizoidal system, spherical, 21-50 u. in diameter, with a dark- 

 brown thick rough wall, contents granular, germination not observed. 



Saprophytic in staminate cones of Pinus, in water culture containing 

 Sphagnum, United States. 



The rhizoidal system which ramified between the pollen sacs and 

 inside between the pollen grains possessed numerous irregularities and 

 swellings. The extramatrical rhizoids which bore the sporangia were 

 tenuous, with large nonseptate fusiform swellings. 



It is strange that this very characteristic form has not been seen again 

 in the quarter century since its discovery. Fortunately, a slide of it is 

 preserved to testify to its very existence! 



AMOEBOCHYTRIUM Zopf 



Nova Acta Acad. Leop.-Carol., 47: 181. 1884 



(Fig. 30 F-G, p. 474) 



Thallus polycentric, eucarpic, consisting of a branched rhizoidal 

 system bearing on it intercalary swellings; sporangia inoperculate, 

 formed by enlargement of the body of the encysted zoospore or of the 

 intercalary swellings of the rhizoids, cut off at maturity by cross walls 

 from the vegetative system and often disarticulated; zoospores without 

 flagella (always?), escaping by forcing one of the gelatinized cross walls, 

 movement amoeboid; resting spores not observed. 



A monotypic genus, with the species known only from the gelatinous 

 sheath of Chaetophora. 



No significant observations on this genus appear to have been 

 published since Zopf s original description. Further study may give a 

 clearer idea of the sequence of development than is to be found in Zopf's 



