120 THE SAPROLEGNIACEAE 



many hyphae occur which bear only antheridial branches. Were the 

 dicHnism preponderant this would approach A. proUfera; other char- 

 acters are like A. polyandra. This then occupies an intermediate posi- 

 tion." Found in the Luneburg Heath, near Hamburg, Germany. 



The species name we give the Chapel Hill plant refers to the failure 

 of most of the eggs to reach maturity. The name Achlya intermedia has 

 been used by Bail and is not available (see under Saprolegnia mouoica). 



II. Achlya Klebsiana Pieters. Bot. Gaz. 60: 486. pi. 21, figs. 1-4. 1915. 



Plate 40 



Threads moderately short to long, growth on termites varying from 

 4-14 mm. across; moderately stout, about 50-94;j, thick at the base and 

 narrowing gradually to the liluntly pointed tips; branches not very 

 numerous, the radiating main threads obvious to the naked eye. Pri- 

 mary sporangia plentiful, mostly from 40-54 x 432-87710., although some 

 on very small hyphae are as small as 20 x 13511.; secondary sporangia 

 abundant, usually including also a part of the hypha below the primary 

 sporangium; at times many very small sporangia arising on slender 

 hyphae form large gemmae. Sporangia emptying as normally in Achlya, 

 but showing all the usual variations and also a unique one (see below) ; 

 spores about ii-I3[j thick, forming a rather loose hollow sphere about 

 the mouth; usually some of the spores do not escape, but encyst within 

 the sporangium. Gemmae formed abundantly by the segmentation of 

 the old hyphae into dense, more or less irregular rods, and by the incom- 

 plete development of sporangia-like tips; after a rest becoming sporangia 

 and emptying by a papilla of very variable length or sprouting by many 

 threads or less often forming many very small sporangia on the ends 

 of the sprouting threads. Oogonia plentiful, borne laterally from the 

 main hyphae on moderately short branches which are of a length less 

 than the diameter of the oogonium (rarely) to three times its diameter; 

 spherical or short pyriform, usually 48-621J. thick, sometimes as small 

 as 34[x; wall smooth, unpitted except under the antheridia. Eggs filling 

 the oogonium, 1-8, usually 6, the diameter 1 8-24rj., sorne slightly flattened 

 by pressure; eccentric, with one large oil drop outside the protoplasm 

 when fully ripe; oil drop Ii-i4>j. thick. Antheridial branches slender, 

 practically always diclinous, never arising from the oogonial stalk though 

 sometimes the basal wall grows up into the oogonium giving the ap- 

 pearance of a thick-walled hypogynal antheridium; simple or sparingly 

 branched, sometimes branching liefore reaching the oogonium and the 

 branches clasping different oogonia. Antheridia clearly abstricted, 

 elongated and usually touching the oogonia with foot-like projections; 

 at least one, usually more, on every oogonium. 



Found once in Buzzard Spring, a shallow spring at edge of bottom 

 land of Yadkin River, near Yadkin College, N. C, March 29, 1921. 

 (H. R. Totten, coll.) 



This well-marked species, known until now only from Michigan, 

 is apparently nearest A. americana, from which it clearly differs in the 



