BIBLIOGRAPHY 375 



Hansgirg, A. (1903) Phyllobiologie. xiv + 486 pp., 40 text-figs. Leipzig, 

 [pp. 143, 151, 154] 1903. 



[This book includes (pp. 52-84) a summarised account, chiefly 

 based upon previous work, of the various types of leaf met with 

 among aquatic plants.] 



Hauman-Merck, L. Sur un cas de geotropisme hydrocarpique chez 



(1913 1 ) Pontederia rotundifolia L. Recueil de 1'Institut Bot. 

 [p. 239 and Fig. 155, Leo Errera, T. ix. 1913, pp. 28-32, i text-fig. 



P- 240] (The author shows that after fertilisation the inflorescences of 



this plant, which have been previously held erect above the 

 water, bend down through an angle of 180 and dip into the 

 water where the fruits ripen.) 



Hauman-Merck, L. Observations ethologiques et syst6matiques sur deux 



(1913 2 ) especes argentines du genre Elodea. Recueil de 

 [PP- 55. 57> 236] 1'Instit. Bot. Leo Errera, T. ix. 1913, pp. 33-39. 



(An account of the morphology and mode of pollination of 

 Elodea densa and E. callitrichoides .) 



Hauman, L. (1915) Note sur Hydromystria stolonifera Mey. Anales del 

 (formerly Hauman- Museo Nac. de Hist. Nat. de Buenos Aires, T. 27, 

 Merck) 1915, pp. 325-331. 



[p- 57] (The author draws attention to root dimorphism and hydro- 



anemophily in this species.) 



Hausleutner, (I85O 1 ) Ueber Aldrovanda vesiculosa. Bot. Zeit. Jahrg. vm. 

 [pp. in, 289] 1850, p. 600. Nachtrag zu Aldrovandia. Bot. Zeit. 

 Jahrg. vm. 1850, pp. 831, 832. 



(These notes describe certain occurrences of this plant in the 

 wild state, and give directions for its cultivation. The author 

 shows that, in nature, it grows among reeds or protected by 

 the leaves of Waterlilies, and that it can only be cultivated 

 successfully if these shade conditions are reproduced.) 



Hausleutner, (i85O 2 ) Ueber eine neue Nymphaea aus Schlesien. Bot. Zeit. 

 Jahrg. vm. 1850, pp. 905-908. 



(This is the record of the occurrence of a new species of Castalia, 

 called by the author Nymphaea neglecta.) 



Hausleutner, (1851) Ueber die Aldrovanda in Schlesien. Bot. Zeit. Jahrg. 

 [p. in] ix. 1851, pp. 301-304. 



(A discussion of the anomalous distribution of Aldrovandia. 

 It has been found in Schlesia in two lakes alone. The author 

 thinks that it is improbable that it is distributed by water- 

 fowl, since it perishes so rapidly on being removed from the 

 water.) 



Hegelmaier, F. (1864) Monographie der Gattung Callitriche. 64 pp., 4 pis. 



[pp. 169, 175, 216, Stuttgart, 1864. 



236* 3 1 J ] (In this memoir the anatomy and floral structure of the genus 



are fully treated and all the species are described. The geo- 

 graphical distribution and affinities are also discussed. The 

 author returns to Robert Brown's opinion that this genus 

 belongs to the Halorrhagideae, and he does not accept the 

 newer view which relates it to the Euphorbiaceae.) 



