April, 1920] MORPHOLOGY, ETC., OF BRTOPHT] 161 



1111. Marie-Victorien, Fr. des E. C. La vie sexuelle chez les Hydrocharltactes. 

 [Sexual life in the Hydrocharitaceae.] Naturaliste Canadien 45: ISO 133, Mar., 1919. — 

 Author notes M. L.-D. Mignatjlt's statement [See following entry, 1112] thai the pollen of 

 Valisneria spiralis escapes from the submerged staminate Bowers, and rising to I 

 fertilizes the pistillate flowers. He then describes the manner of fertilisation of and 

 genus of the order, Philotria Canadensis (Michx.) Britton. The staminate fli 



bottom of the water becoming inflated with gas, break <>fT and rise, spreading th<- pollen grains 

 on the surface of the water where they are supported by the air enmeshed 1 minute 



capillary processes growing out of the outer envelop of the grain. The pistillate Bowers are 

 also brought to the surface of the water, but by an extraordinary extension of th<- perianth. 

 The stigmas are curved so as readily to make contact with the floating pollen.— A. //. Mar Kay. 



1112. Mignault, L.-D. Une plante interessante. [An interesting plant.] Naturaliste 

 Canadien 45: 101-103. Jan., 1919. — A popular sketch of the form, habitat and habits of Vil- 

 lisneria spiralis. — A. H. Mac Kay. 



1113. Phillips, R. W. Note on the duration of the prothallia of Lastraea filix-mas fPresl). 

 Ann. Bot. 33: 265-266. 1919.' — Prothallia growing en pieces of coke were placed in a glass- 

 covered basin on a feebly illuminated shelf. After two years they had grown upright to a 

 height of 15 mm. though only 1 mm. broad. Antheridia were abundant but no archegonia 

 were found. Some were transplanted to suitable conditions and grew normally producing 

 young plants. The remainder were replaced and lived for six years in the unfavorable con- 

 ditions. — W. P. Thompson. 



1114. Rowlee, W. W. Synopsis of the genus Ochroma, with descriptions of new species. 

 Jour. Washington [D. C] Acad. Sci. 9: 157-167. 1919. 



1115. Small, James. The origin and development of the Compositae. New Phytol. 18: 

 65-89. Fig. 41-55. 1919.— See Bot. Absts. 3, Entry 1142. 



1116. Weatherwax, P. The morphological basis of seme experimental work with maize. 

 Amer. Nat. 53: 269-272. 1919. 



MORPHOLOGY AND TAXONOMY OF BRYOPHYTES 



Alexander W. Evans, Editor 



1117. Evans, Alexander W. A new Riccia from Peru. Torreya 19: 85-88. lfig. 1919. 

 — Riccia bistriata sp. nov. is described. This species was collected by Cook and Gilbert at 

 Santa Ana, Peru, June 25, 1915. It is the only adequately published Riccia from Peru. It 

 differs from all other Marchantiales in the peculiar bands of thickening which are found in the 

 walls of the green cells. These are illustrated in the figure. — J. C. Nelson. 



1118. Gertz, Otto. Anomalier hos rhizoidema a gredd-knoppar af Lunularia cruciata L. 

 [Anomalies in the rhizoids on the gemmae of Lunularia cruciata.] [Swedish, with German 

 resume\ ] Bot. Notiser 1918: 141-150. 21 fig. 1918.— The authcr has made cultures in the 

 following media: distilled water; 0.1 per cent NH 4 K0 3 ; 1 per cent KNO s ; 1 per cent NaNOjJ 

 0.1 per cent glycerin. The anomalies were apparently prcduced by the toxic effects of the 

 minute quantity of copper contained in the distilled water; 1 y lit lil crated nitric acid in 

 the NH4NO3 solution; and by the liberated potassium and sodium hydrates in the Kl 

 and NaN0 3 solutions, respectively. Regarding the anomalies prcduced in the glycerin si lo- 

 tion the author offers no explanation. — P. A. Rydberg. 



1119. Williams, R. S. The genus Eesmatcdon in Korth America. Bull. Torrey I 

 Club 46: 207-220. PI. 11. 1919.— A diseussicn is given of the genus Desmatodon with ke; 

 and description of, the following species: D. latifolivs (Hedw.) Erid.. D. suberectus H 



BOTANICAL ABSTRACTS, VOL. Ill, XO. 4 



