Algae. — ^'ungi, Bacteria und Pathologie. 295 



for algae. The walls are nearly everywhere covered with a dark, reddish 

 brown coating consisting generally of Gloeocapsa Magma, Stigonema 

 minutum, Stigonema hormoides, and Scytonema ocellatiim. Various other 

 blue-greens are recorded from this habltat. Sterile Zygnema was found 

 in the thin sheet oi the stream as it flowed swiftly over a smooth rock_, 

 and as an adaptation to this unusual habitat, the filaments had „developed 

 Short rhizoidal projections, in much the same way as of Rhizoclonium 

 riparimn the forma polyrhiziim attaches itself to surf-beaten rocks". 

 Attention is called to the fact that R. tortuosum, though without rhizoids, 

 resists wave action by its densely crisped and twisted fronds which enable 

 it to become entangled with other algae. None of the species reported 

 by Farlow from this locality were found, suggesting that the variety 

 of forms along the wall is greater than supposed or that the species 

 vary from year to year. Moore. 



Hardy, a.D., The Fresh-WaterAlgae of Victoria. (The 

 Victorian NaturaHst. Vol. XXI. No. 6. Oct. 1904. p. 81 



—87.) 



A few general remarks are made on fresh-water algae as a group, 

 and work previously done in the colony and elsewhere is alluded to. 

 Colour and reproduction are specially dealt with and the latter process 

 is described in detail for Protococcus viridis and Hormiscia zonata. Cer- 

 tain peculiarities of shape and disposition of chromatophores and py- 

 renoids are described, as characteristic of some genera. Remarks are 

 also made on fossil diatoms. E. S. Gepp-Barton. 



West, G. T., Remarks on Gloeocapsa. (Trans. Edinburgh 



Fiele! Naturalists' and Microscopical Society. Vol. V. Part II. 



1904. p. 130-133. pl. XV.) 



The author describes the life history of Gloeocapsa crepidinitm, which 

 occurs upon mud etc. in brackish and salt water; seven stages in the life 

 history are figured in colours. The thick hyaline integument is not a gela- 

 tinous modification of the cell wall, but is excreted by the cell. Multipli- 

 cation takes place by simple cell-division. The daughter-cells secrete each 

 their own integument, being still enclosed within the much stretched mother- 

 cell integument. Thus colonies of two or four cells with lamellated inte- 

 gument are formed. Finally the young cells are liberated by the rupture 

 of the primary integument, and each forms a new colony. At intervals 

 a cell developes a spiny cellulose coat outside the integument and be- 

 conies a resting-cyst. After a period of rests it produces a new colony 

 by simple cell-division, the remains of the spiny coat being traceable for 

 a time. A colony of two cells^ with integument, measures about 

 55 /* X 45 /< ; a colony of four about 85 u X öO /'• Chlorophyll grains 

 are exceedingly minute and irregulär. For mounting it is recommended 

 to place the material, with water at one end of a dish which is covered 

 over except at the opposite end; the organisms then leave the mud and 

 travel towards the illuminated end, and can be removed with a pipette 

 and preserved in the following Solution : Copper acetate 0,5 gram, dis- 

 tilled water 100 cc; mix^ and add at ordinary temperature gum acacia 

 65 grams; when it is dissolved add pure glycerine 55 cc, mercuric Chlo- 

 ride 2 grams; füter before use. E. S. Gepp-Barton. 



Clinton, J. R, North American Ustilagineae. (Proc. Boston 

 Soc. Natl. History. XXXI. p. 329—529. 1904.) 



In this paper the author gives a systematic treatment of the North 

 American species of the Ustilagineae. It is hoped that the present 

 work may be extended „until it includes all of the species and many of 

 the hosts reported from this continent." Further work is to be done, or 

 is already under way, upon spore germination, artificial cultures, infection 



