Algae. 379 



Collins, F. S., The green algae of North America; Sup- 

 plementary paper. (Tufts Coli. Stud., Sei. Ser. III. 2. in part. 

 p. 69—109. pl. 1—2. April, 1912.) 



This paper is supplementary to the large work by the same writer 

 published as Vol. II, N*^. 3, or the same series.in 1909, and consists 

 of additions, corrections and descriptions of new material. Besides 

 several new formae the following species and varieties are here 

 described by the writer as new. Spirogyra Juergensü V2ir. tenuispira, 

 from Massachusetts, S. inconstans, from Illinois, Moiigeotia Tran- 

 seauii, from Illinois, Monostroma amorphum, from California, Sti- 

 geoclonium subsimplex, from Massachusetts, 5. aiitumnale, from 

 Massachusetts, and Pithophora Mooreana, from a pond containing 

 cultivated Japanese plants. 



The following new "combinations" occur: Mougeotia ventricosa 

 (Wittr.) Collins; M. Boodlei (W. & G. S. West) Collins, Ankistrodes- 

 mus falcatus var. fusifonnis (Corda) Collins, Ank. Braiinii (Naeg.) 

 Collins, and Ank. fractus (W. & G. S. West) Collins. Maxon. 



Gpoves, H. and J., Characeae from the Philippine Islands. 

 ;Philip. Journ. Sei. C. Bot. VII. p. 69—70. June, 1912.) 



Critical notes upon 9 species of Nitella and Chara now reported 

 from the Philippine Islands, with citation of specimens. 



Maxon. 



Hoffman, E. J., Fru ctification of Macrocystis. (Univ. California 

 Publ. Bot. IV. 9. p. 151 — 158. pl. 20. Febr. 25, 1911.) 



The results gained from an investigation of California material 

 determined as Macrocystis pyrifera are at variance with those pu- 

 blished by Misses Smith and Whiting, the present study indica- 

 ting that the "sorus is not confined to the newly formed bladderless 

 leaves alone, and that the reproductive bodies appear in continuous 

 instead of disconnected layers only in the furrows of the leaves." 



Maxon. 



Lambert, F. D., Didymosporangium repens, a new genus and 

 species of Chaetophoraceae. (Tufts Coli. Stud.. Sei. Ser. III. 2, 

 in part. p. 111 — 115. pl. 3. April, 1912.) 



Description of Didymosporangium repens Lambert, a new genus 

 and species of the family Chaetophoraceae, described from specimens 

 collected upon Antithamnion , at Naples, Italy. lUustrated by 

 numerous figures at scale 1000. Maxon. 



'& ' 



Lewis, I. F., Alternation of generations in certain 

 Florideae. .'Botanical Gazette. LIII. p. 236—242. March, 1912.) 



Cytological observations on Polysiphonia, Griffithsia, and Deles- 

 seria having shown it to be probable that in these genera at least 

 (and presumably in all Florideae in which tetraspores and sexual 

 Organs are regularly borne on separate individuals) there exists an 

 alternation of sexual and asexual plants, the carpospores giving rise on 

 germination to asexual, and the tetraspores to sexual individuals, the 

 author undertook to prove this by actual cultivation of the sporelings 

 to maturity. The present paper is a partial record of results. It was 



