CHYTRIDIALES 269 



Phlyctidium pollinis (Braun) Sorokin, Arch. Bot. Nord France, 2: 19, fig. 



13. 1883 (separate). 

 Phlyctidium pollinis-pini (Braun) Schroeter, Kryptogamenfl. Schlesien, 3 (1): 



190. 1885. (Seep. 270). 



Sporangium sessile, spherical or nearly so, somewhat urceolate after 

 discharge, with a more or less prominent fairly broad apical papilla, 

 10-25 [x in diameter, wall smooth, colorless, of variable thickness up 

 to 1.4 [j.; rhizoids branched, arising from a more or less prolonged 

 axis; zoospores spherical or ellipsoidal, 2-4 u, in diameter, with a 

 colorless eccentric globule and a long flagellum, emerging singly and 

 slowly through a broad apical pore formed upon the deliquescence 

 of the papilla, movement hopping; resting spore sessile, spherical, 

 10-15 [l in diameter, with a smooth thick wall and a large globule; 

 rhizoidal system branched, germination not observed. 



Parasitic or saprophytic on floating pollen of Pimis syhestris, Braun 

 (loc. cit.), Pinus spp., pollen of various angiosperms used as bait in 

 water cultures (Phlox, Tropaeolum, Helianthus, Populus, etc.), Zopf 

 (loc. cit.), pine pollen, Schroeter (1885: 190), Sydow (Exsiccati: Sydow, 

 Phyco. et Prot. 47; Mycoth. March. 4714), isolated from soil, Remy 

 (1948: 214), Germany; pollen of fir, Sorokin (1883: 19, fig. 13), South 

 Russia; pollen grains of "barrtrad," Lagerheim (1884 [1]: 100), 

 Sweden; Maurizio (1895: 14), Switzerland; pollen of Pinus syl- 

 vestris, Valkanov (1931a: 362), Bulgaria; pine pollen, Couch (1932: 

 250, pi. 15, figs. 20-25), Pinus syhestris pollen, Karling (1941b: 108), 

 pine pollen, Sparrow (1952d: 763), United States; fern spores and 

 pollen grains, Karling (1946c: 334), Brazil; Keteleeria pollen, Shen 

 and Siang (1948: 181), China; pine-pollen bait, soil, Sparrow (1952a: 

 36), Cuba. 



The species with multiporous sporangia described by Zopf and widely 

 reproduced as illustrative of Rhizophydium pollinis-pini (see Fischer, 

 1892: fig. 16b; Migula, 1903: pi. 2 K, fig. 5; Fitzpatrick, 1930: fig. 20a) 

 is R. sphaerotheca (see p. 249). Since no description or figures were 

 published of the form on Tribonema bombycina, collected by Itzigsohn 

 (see Braun, 1856b : 588), it cannot be compared with the present species. 

 Presumably, there was a close resemblance, for Braun considered his 

 fungus on pine pollen to be identical with it and suggested that the spe- 



