MONOBLEPH ARID ALES 731 



idia, where the hypha will occasionally give rise to two oogonia without 

 the alternation of an antheridium. A single antheridium usually contains 

 4-7 amoeboid uniflagellate antherozooids approximately 3.5[j. by 1 .5-2 \x. 



"Each oogonium produces a single spherical oospore, 13-23 u, in 

 diameter (majority 17 \x), and is nearly always exogenous when mature. 

 These oospores are spherical in shape, thick-walled, golden brown in 

 colour, and covered at maturity with light yellow, transparent bullations, 

 2 jjl in height. When the oospore reaches the outside of the oogonium 

 it remains attached to the oogonial mouth for some time before it falls 

 away. When endogenous oospores are found, the oospore is seen to fill 

 the diameter of the oogonium, and bullations are to be found only upon 

 those surfaces of the oospore which are not adpressed to the walls of 

 the oogonium. Oospores produce a vegetative hypha on germination . . . 



"Zoosporangia are narrowly cylindrical, 72-104 u. in length by 5-7 \i 

 in diameter when borne singly in a terminal position, or 21-38 ;j. in 

 length by 5 \x in diameter when borne in a row. Occasionally borne in 

 an intercalary position. Zoospores, amoeboid, uniflagellate, 4-9 u. by 

 3-5 \x, arranged in a single or double row, inside the sporangium" 

 (Perrott, loc. cit.). 



On submerged twigs of Quercus robur, Perrott (loc. cit.) ; twigs, Barnes 

 and Melville (1932: 84, fig. 1), Sparrow (1933b: 528; 1936a: 459), Great 

 Britain; Woronin (1904: 1-24, pi. 1, figs. 1-16, pi. 2, figs. 17-19, 21-27, 

 pi. 3, figs. 50-53), Finland ; Laibach (1927: fig. 8), Hohnk (1935), 

 Germany; Thaxter (F.), Sparrow (S.) (1932b: 290, pi. 7, fig. F; 1933b: 

 528, pi. 20, figs. 1-4, 29; 1933c: 530), coll. Linder, Sparrow (1933b), 

 Wolf (1944: 18), Beneke (1948:30), R. M. Johns (comm.), (North 

 Carolina) United States; Apinis (1930: 237), Latvia. 



See remarks under Monoblepharis sphaerica, p. 729. 



Monoblepharis macrandra (Lagerheim) Woronin 



Mem. Acad. Imper. Sci. St. Petersb., Phys.-Math. CI., VIII, 16: 13, pi. 2, figs. 



32-46, pi. 3, figs. 47-49, 54-70. 1904 



(Fig. 53 E, p. 730) 



Monoblepharis polymorpha Cornu, pro parte, Ann. Sci. Nat. Bot., V, 15: 84, 

 pi. 2, figs. 10-32. 1872; van Tieghem, Traite de Botanique (1874 ed.), figs. 

 167 C, 7 p-q. Paris. 



