MONO BEEP H ARID ALES 729 



(this tube occasionally curved and reaching 4-10 \i in length), 10-23 u. 

 long (majority 15 u.) by 4-6 u, in diameter; antherozoids amoeboid, 

 uniciliate, 3.5 by 2 \i, four to seven in a single antheridium; usually 

 protandrous; oospores single, spherical, endogenous, germinating in 

 situ, thick-walled, golden brown, covered when mature with closely 

 arranged, colorless to pale-yellow bullations 1-2 u. in height, diameter 

 varying from 12.5 to 23 [i (majority 17-19 p.). (Modified from Perrott.) 



On submerged twigs, Cornu (1871 : 59), France; twigs of Quercus 

 robur, Perrott (1955: 270, pi. 11, figs. 3-4, text fig. 12), Great Britain. 



Perrott (1955) has pointed out that Woronin (1904) and later authors 

 who followed him were in error in ascribing to Cornu's species a form 

 having exogenous oospores. As is clearly shown by both Cornu and 

 Perrott these spores are characteristically borne endogenously in Mono- 

 blepharis sphaerica. 



An attempt is made here to separate the citations of occurrence 

 referring to the true Monoblepharis sphaerica from those incorrectly 

 ascribed to it in the past, and now belonging under M. hypogyna. 



Monoblepharis hypogyna Perrott 



Trans. Brit. Mycol. Soc, 38: 272, fig. 13. 1955 

 (Fig. 49 E-G , p. 704; 53 C, p. 730) 



Monoblepharis sphaerica Cornu emend. Woronin, Mem. Acad. Sci. St. 

 Petersb., Phys.-Math. CI. VIII, 16: 1-24. 1904, pro parte. 



"Mycelium well developed, consisting of cylindrical, somewhat rigid, 

 usually sparingly branched hyphae 1-2 mm. long, and varying in diam- 

 eter from 7.5 u, in the stouter basal portions to 2 \l at the tip (average 

 3-5 u,). 



"Oogonia narrowly pyriform, occurring singly and terminally or 

 occasionally in a series alternating with antheridia, or in a fascicle, at 

 a hyphal tip; rarely intercalary. Length 21 45 \x (majority 25-34 u.); 

 diameter 8-19 \x (majority 13 u.). 



"Antheridia narrowly cylindrical, hypogynous, opening by a slightly 

 exserted tube just beneath the oogonial cross-wall. Length, 9 27 ;a; 

 diameter 4-9 \x. An antheridium is nearly always present at the base of 

 each oogonium, except in the case of some series of oogonia and anther- 



