VAUCHERIA. 153 



VAUCHERIA TERRESTRIS, Lyngb. 



Forms densely interwoven, thin, rather dark green strata, 

 on moist soil. Oogonia usually single, sometimes in clusters, 

 pedunculate, attached by a flattened base on the back of the 

 incumbent, elongated, curved, antheridium. Mature oospore 

 enclosed in a hyaline colorless sporoderui, composed of 

 several membranes, considerably inflated. 



Syn. Ectosperma terrestris, Yauch. ; Vaucheria drdnata, Kg.; 

 Vaucli. polymorplm. Wood. 



Damp ground, clayey soil, green-houses, etc., often form- 

 ing considerable patches. 



Plate CXXIX, figs. 1-5, parts of fruiting filaments 

 variously developed with one, two and more oogonia on a 

 peduncle ; figs. 6-8, oospores germinating. 



VAUCHERIA VELUTINA, Ag. 



1 ' Filaments exceedingly tough, interwoven into a dense, 

 velvety, green stratum, pellucid below and creeping over 

 the mud ; branches near the extremity erect fastigiate, and 

 more or less crooked ; oogonia solitary, globular, on short 

 lateral peduncles." -Carmichael. 



Diameter of oogonia, 57-68 JJL. 



North Carolina, Schweinitz ; West Point, New York ; 

 Waterville, Maine; Culpepper, Va., Bailey. 



Have quoted the above from Wood's Contribution, p. 180. 

 I have not recognized a plant to correspond in all particulars ; 

 appears to be near V. sericea in general character and also 

 near V. Dittwynii in fruit. 



VAUCHERIA PILUS, Martens. 



Has the habitat and form of a very robust V. dichotoma. 

 Filament simple or sparsely branched ; diameter 180-200 yw ; 

 long ; often hyaline, and mucose to the touch ; apex rounded, 

 sometimes slightly inflated ; cell contents mucilaginous, 

 granular, dull green. When dried, ash-gray, silky. Oospore 

 nearly twice the diameter of the filament. The only speci- 

 mens of this form of extraordinary size are from a ditch 

 near Charlotte, Vermont. Coll. F. H. Hosford. 



The value of the species may be somewhat doubtful, as 

 suggested by Rabenhorst. The specimens received were too 

 limited and incomplete for a decided opinion ; nevertheless 

 the parts examined were of gigantean proportions. 



Plate CXXVII, figs. 1-4, 



