996 AQUATIC PHYCOMYCETES 



Lagenidium papillosum Cocconi 

 R. Accad. Sci. Istituto Bologna, Mem. Ser. V, 4: 362, figs. 1-3. 1894 



Thallus resembling that of Lagenidium rabenhorstii; plants monoe- 

 cious, oogonia and antheridia like those of L. rabenhorstii; oospore lying 

 very loosely and centrically in the oogonium, with a thick smooth inner 

 wall and a densely bullate outer wall. 



In Spirogyra sp., Cocconi (be. eit.), Italy; Spirogyra sp., Voronichin 

 (1920: 12), Russia. 



The mature oospore was observed in some specimens to be sur- 

 rounded by residual protoplasm, termed "periplasm" by Cocconi. 



The sporangial stage, from the figures, is somewhat anomalous. Zoo- 

 spores are pyriform and biflagellate, the flagella appearing apically 

 attached. 



Lagenidium distylae Karling 

 Lloydia, 7: 330, figs. 69-107. 1944 



"Thalli usually elongate, tubular, curved, irregular, lobed and occa- 

 sionally branched, 6-10 u, in diam., consisting of 2-8 segments, 6-9 x 

 30-40 [x. Sporangia of same size and shape as segments with one short 

 4 X 7 [i., or long, 3 x 25 u., exit tube; content of sporangium emerging 

 as a naked mass, becoming enveloped by a vesicular membrane, and 

 undergoing cleavage [into] zoospores. Zoospores reniform, 6 x 8 \x, 

 diplanetic; cystospores, 6.6-7 \x. Oogonia and antheridia borne on same 

 thallus; oogonia oval, broadly spindle-shaped and locally paunchy, up 

 to 20 (jl in diam., and 30 \x in length. Antheridium elongate, tubular, 

 5-8 x 20-30 [jl. Oospores hyaline, smooth, spherical, 12-18 \x, oval, 

 8-10 X 12-15 [jl; content granular with a large vacuole; germination 

 unknown" (Karling, be. eit.). 



Parasitic in the eggs of Distyla sp., Brazil. 



The vesicle surrounding the protoplasm ejected from the sporangium 

 is said by Karling to be developed in this species after, not coincident 

 with, emergence. The antheridium is a well-defined structure, as in 

 Lagenidium rabenhorstii. 



Lagenidium parthenosporum Karling 

 Lloydia, 7: 329, figs. 35-68. 1944 

 "Thallus consisting of 1 to 5 segments, larger thalli septate, elongate, 



