Januakt 29, 1904.] 



SCIENCE. 



171 



kinds of plants: (1) Potamogetons, not 

 yet in frait, prominent among which was 

 Potamogeton amphifoUus Tuckerman, 

 which formed an unbroken band about the 

 margin of the lake. (2) In most places a 

 narrow strip of some species of Char a. (3) 

 Castalia tuierosa (Paine) Greene, and 

 Nymphcea advena Soland, usually mixed, 

 but sometimes only one or the other, 

 formed a band ten to thirty feet in width, 

 and this band was rarely broken, and then 

 only for a space of ten to thirty feet. (4) 

 In many places were narrow patches of 

 Pontederia cordata L., but scarcely ever in 

 long strips. (5) Typha latifolia L., with 

 very rarely an exception of a few feet, 

 formed a band from five to twenty feet in 

 width. (6) Sedges in variety with some 

 species of rushes and grasses, and others of 

 like needs formed an uninterrupted band. 

 (7) Several species of Salix, or some one or 

 two, surrounded the lake completely. (8) 

 A band of Larix laricina (Du Roy) Koch 

 was unbroken excepting for a few rods on 

 the north, where it may have been formerly 

 cut aAvay next to a cleared farm. As the 

 condition of the margins of the lake and 

 surrounding it are so nearly uniform, we 

 have reason to expect the zones of vegeta- 

 tion will be little if at all interrupted. As 

 the descent of the bottom from the flat 

 margins of the lake to the deep water are 

 so rapid, there is only room for narrow 

 zones of vegetation. Beyond the eighth 

 zone (of Larix) in two places for a quar- 

 ter of the circumference the slope rises 

 rapidly to dry arable land, while in the 

 remaining three fourths there are many 

 kinds of aquatic and lowland plants. In 

 all his travels, the author never remem- 

 bers to have seen a place where so many 

 zones of plants were so well marked for 

 so long a distance as were found at Jones' 

 Lake. 



The Genus Marpochytrium, its Develop- 

 ment, Synonymy and Distribution: G. 

 F. Atkinson. 



Describes the genus Harpochytrium, its 

 structure, formation of sporangia and 

 spores; the movement of the spores and 

 attachment to host. Also discusses the 

 synonymy as well as the distribution of the 

 genus in different parts of the world. 



The Phylogeny of the Lichens: F. E. 



Clements. 



(1) A general consideration of the un- 

 derlying principles of polyphylesis ; (2) a 

 detailed discussion of the points of eon- 

 tact of fungi and lichens; (3) the treat- 

 ment and classification of lichens as para- 

 sitic fungi. 



The Necessity for Reform in the Nomen- 

 clature of the Fungi: F. S. Eaele. 

 Cites the conflicting usages in Engler 

 and Prantl 's ' Pflanzenf amilien ' and in Sae- 

 cardo's 'Sylloge Fungorum' to show that 

 there is no unanimity in the use of 

 genus names for fungi at the present time. 

 Shows from unpublished data in regard to 

 the types of the earlier genera that in 

 forty-flve per cent, of these oases the ear- 

 liest available name is not used by Sac- 

 cardo. Shows that this process of shifting 

 generic names from one group of species 

 to another is still in progress and urges 

 that immediate steps be taken to put a 

 final stop to the practice. 



Taxonomic Value of the Spermogonium: 



J. C. Arthur. 



The physiological significance of the 

 spermogonium is yet unknown. It had 

 been tentatively assumed to be associated 

 with sexual reproduction as the male struc- 

 ture. It has been known for more than 

 fifty years, and it 'still bears the name 

 given by the discoverer, Tulasne, but its 

 sexual character is still problematical. 



