40 



STAURASTRUM, Meyen.— ^/. trifidum, Nordst.; i"/. Brasiliense, 

 Nordst.; 6"^ senarium, Ehrb.; St. quadrangulare, Breb.; St. aculea- 

 tum, Ehrb.; St. setigerum, Cleve.; St. Matifeldii, Reinsch; St. rotula, 

 Nordst. ; and St. Meriatii, Reinsch, var. minus-penfagomim. These 

 nine forms were collected by Capt. J. Donnell Smith in Florida. 

 St. rugulosutn, Breb. Pennsylvania. St. Ophiura, Lund; St. arcu- 

 atum, Nordst.; St. Haaboeliense, Wille; and St. genwiatum, Nordst. 

 New Jersey. St. terebrans, Nordst. Pennsylvania and New Jersey 



ARTHRODESMUS, Ehrb.— ^. divergens, Rab., and A.jubulatus, 

 A. Br. Collected in Florida by Capt. J. Donnell Smith. 



XANTHIDIUM, Ehrb.— X asteptum, Nordst., and X. antelo- 

 paeum, Y^r. pofytnazon, Nordst, and var. triquetrian, Nordst.— the latter 

 finely in fruit. Pennsylvania, 



SPIROGYRA, Link.— 6". punctata, Cleve. Atsion, N. J. 



ZYGOGONIUM, Ktz. — Z. anomalum, Hass., var. crass um, 

 n. var. In. measurement near Z. crassum, Ktz., but having the sheath 

 of Z. anomalum. Diam. .0025"— .0026"; arts. 1-3 diameters. 



CONFERVA, Link. — C. amoena, Ktz. Mountain streamlet, Penn- 

 sylvania. C. laeve, Ktz. Madison Lake, Wisconsin. Collected by 

 Rev. H. D. Kitchel. 



RHIZOCLONIUM, Ktz.— ^. Julianum, Ktz. Connecticut and 

 Massachusetts. 



OEDOGONIUM, Link.— O^. Franklinianmn, Witt 



vide No. 309 of Wittrock and Nordstedt's "Exsiccatae." Collected 



m Franklin Pond, New Jersey. OE. stagnate, Ktz. Bound Brook, 



N. J. OE. zigzag, Cleve, and OE. acrosporum, DeBy. Pennsylvania. 



BULBOCHAETE, Ag.—B. recfangu!aris,Wiit. Pennsylvania. B. 



nana, ^ lit. Pennsylvania and New Jersey. B. mirabilis,\N'iit. 

 New Jersey. 



MICROTHAMNION, Naeg.— J/. Kutzingianutn, Naeg. Water- 

 troughs, etc. Pennsylvania. 



^ DRAPARNALDIA, Ag.— Z>. spinosa, Ktz. In streamlet, Glen 

 Onoko, Pa. 



ENTOCLADIA, Wille.— ^. Wittrockii, Wille. Parasitic on 

 aquatic plants. 



ULOTHRIX, Ktz.— ^7. Z^«^r/«a/zi'/, Ktz. This is a submarine 

 plant and was collected by C. G. Pringle, at Presque Isle Lower 

 Canada. It is nearly related to Hormotrichum ( Ulothrix) Young- 

 eanum, H. Carmichaelii, etc. It presents a peculiar character in the 

 longitudmal division of the cells of some of the filaments, which di- 

 vide and re-divide a number of times. ' Normally, there should be 

 only one row of cells in each sheath; but specimens are found having 

 from two to ten rows. In such a case the sheath widens at each di- 

 vision A similar, seemingly abnormal appearance is often observed 

 m a Ulothrix \Hormidium) found in Sweden. In this case the di- 

 vision continues indefinitely until the leaf-like form (known as Pras- 

 lola crispa) is produced. The question is, what is Ulothrix under 

 such circumstances ? Is it not an undeveloped form of Prasiola V 



RHODOPHYCEAE. 



PORPHYRIDIUM, Naeg.-/>. cruentum, Ag. Not infrequent 

 on moist earth and on shaded pavements. 



