PLASMODIOPHORALES 781 



RECENTLY DESCRIBED TAXON 

 Woronina pythii Goldie-Smith 

 J. Elisha Mitchell Sci. Soc, 72: 348, figs. 1-8, 16-35. 1956 

 (Fig. 59 E-H, p. 786) 



"Obligate parasite in species of Pythium, causing galls which are 

 always delimited by septa, often in catenulate series. Nuclei undergoing 

 cruciform divisions during vegetative stages of Plasmodium. Mature 

 Plasmodium forming a sorus of zoosporangia, or a cystosorus composed 

 of resting spores. Zoosporangia thin-walled, spherical or ovoid, about 

 4.9-8.8 (x in diam. Zoospores biflagellate, with one long posterior and 

 one short anterior flagellum ; discharged through papillae formed only 

 on some sporangia on the periphery of the sorus; encysting on the 

 hyphae and other organs of the host, and germinating with a short, 

 swollen penetration tube. Resting spores about 3.7-5.6 \i in diam., 

 smooth, thick-walled, loosely associated in a cystosorus, forming a 

 sphere or flattened spheroid with its greatest diameter usually less than 

 the diameter of the gall containing it, golden-brown in color. Sporangial 

 and resting spore membranes without cellulose, as shown by a negative 

 reaction with chlor-iodide of zinc" (Goldie-Smith, be. cit.). 



Isolated from soil, United States. 



IMPERFECTLY KNOWN SPECIES OF WORONINA 



? Woronina elegans (Perroncito) Fischer 



Rabenhorst. Kryptogamen-Fl., 1(4):66. 1892 



Chytridium elegans Perroncito, Centralbl. f. Bakteriol., Parasitenk. u. 

 Infektionskrankh., Abt. 2, 4: 295. 1888. 



Sporangia sorus spherical or somewhat stellate, filling the body cavity 

 of the animal, 60-110 \x in diameter, with rose-red contents; sporangia 

 8-20 or more, spherical or pyriform, 20-30 a in diameter, discharge 

 tube 5-100 ii or more long by 3-4 \x in diameter; zoospores 30-50, ovoid, 

 reddish, 4-5 ;ji long by 2-3 (j. thick, with two long oppositely directed 

 fiagella. 



Parasitic in adults and eggs of Philodina roseola, in a thermal spring, 

 Italy. 



