Phycomycetse, Chytridiacese, Zygforhizidium. Mo 



calem v. per hanc ipsam liberatis, sed zoosporis non examinatis; 

 membrana zoosporangii hyalina, levi ; sporis (v. angiis) perduran- 

 tibus singulis, membrana echinata, hyalina iustructis, in parte in- 

 tramatricali orientibus. 



Hab. in Spyrogyra in Dania. 



2. Phlyctochytrium aequale Atkins., Botan. Gazette XLVIII (1909) 3246 

 p. 338, cum icon. — Zoosporangio globoso. sessiii, 6 [x. circ. diam., 

 basi subsporangiali aequaliter crassa, rhizinis longis ramulosis 

 prsedita. 



Hah. in Spirogyra insigni prope Ithaca N. Y. Amer. bor. 



3. Phlyctochytrium planicorne Atkins., Botan. Gazette XLYIII 3246 

 (1909) p. 337, cum icon. — Zoosporangio ellipsoideo 6 « 8, apice 



4 cornibus ornato; cellula inferiori 3 [x. lata, rhizinis angustis ra- 

 mosis radiantibus pra-dita. 



Hu6. in celluUs Spirogyrse variantis prope Ithaca N. Y. 

 Amer. bor. — Socium frequens Lagenidii americani. 



MONOCHYTRIUM Griggs Rob. F., The Ohio Naturalist X (1910) 

 pp. 44-54, cum 2 tab. (Etym. monos unicus et chytrion ollula . — 

 Mycelium nullum, plasmodium rotundatum. Sporse perdurantes, 

 globosse, ortse a copulatione zoosporarum intra cellulas matricis, 

 binucleatge, exosporio crasso piene levi non echiuulato; zoosporan- 

 gia a zoosporis sine copulatione formata, unum a quoque plasmo- 

 dio, sine membrana, sine collo; zoospora^ numerosissinue, moto 

 ignoto. 



1. Monochytrium Stevensianum Griggs Eob. F., 1. c. Char. generis. 3247 

 Hab. intra cellulas foliorum v. petiolorum Ambrosi;o arto- 

 misiifolicie, E-aleigh North Carolina Amer. bor. (Stevens et 

 Hall). — Sponie perdurantes 30-50 [j.. diam. ; zoosporangia circ. 

 70 [j-. cr. ; zoosponu 2,5 [j.. 



ZYGORHIZIDIUM Loewenthal, Arch f. Protistenk. V (1905) p. 228 

 (Etym. zygos jugum et lihizidium). — Fungus ex zoosporis for- 

 matus, extramatricalis, rhizoidibus cum ve&icula tantum iutrama- 

 tricalibus, globosus vel piriformis, 4 ad 15 [j.. long. ; 1-pauci- 

 nucleatus v. in individuis majoribus plurinucleatus ; demum in 

 zoosporangium operculo plano dehiscens mutatus; zoosporangiis 

 pro magnitudine a 4 ad 40 zoosporas gignentibus. Pr;uterea adest 

 multiplicatio per zygosporas. — A Rhizidio imprimis operculo 

 zoosporangii et sexualitate distinguitur. 



