ZOOLOGY AND BOTANY, MIUK08C0PY, ETC. '^05 



faded tihiments of Trentepoldia ii,mbrina Born. 7. The unpublished 

 species, Apiorystis Wilsoni J. Ag., is synonymous with Cleve's Istlimia 

 membranacea^ a fact which J. G. Agardli had noted though he had left 

 the genus standing. XXIII. Further observations are made on Ulnthrix 

 subflaccida Wille. XXIV. A new species, Lijngbya epiphyiica, is de- 

 scribed, growing on Rhizocloniam hieroylyphicum on the Norwegian 

 coast. 



Ulothrix flaccida.* — N. Wille describes the development of riothrix 

 fiaccida Kiitz. which he has studied on the melting sea-ice at Christiania, 

 and on rocks irrigated by fresh water at Drobak. The marine plants 

 reproduced themselves by akinetes and gametes, the former growing 

 into new filaments direct. The gametes, formed singly or in pairs in 

 the mother-cell, are of two kinds, macro- and microgametes. They 

 have two cilia and a red stigma. The fresh- water plants have thicker 

 filaments and shorter cells, and form aplanospores and gametes. The 

 aplanospores, to be regarded as reduced zoospores, arise singly in a cell, 

 and after escape may at once germinate. They then either divide and 

 form a Palmella stage, or they go through a resting stage. The resting 

 aplanospores develop a short-bristled membrane, and show great simi- 

 larity to certain species of Troclmcia. The germination of the resting 

 spores was not observed. The gametes may be macro- or microgametes, 

 and sometimes copulate. The macrogametes can germinate partheno- 

 genetically. A. new variety of PJasmophagus CEdogomorum de Wild, is 

 described, growing endophytically in the marine plants, and is called 

 var. Ulotkricis. 



Callose in Marine Siphonese.-f — R. Mirande has made a large series 

 of experiments on the thallus of Oaiderpa, with a view to determining 

 its chemical composition. He finds that cellulose, properly so-called, 

 is absent from the membrane, which is on the contrary composed of a 

 pectic substance and callose. He describes the methods by which he 

 reached these conclusions. The substance w^hich forms the sphero- 

 crystals is composed of callose. Callose is in fact the fundamental 

 constituent of the membrane of Gaulerpa. Hitherto callose has only 

 been recorded as associated with cellulose, and the author therefore 

 describes here a new type of chemical constitution among the vegetable 

 kingdom. He continued his researches by examining other Siphone^e, 

 and found that all the series of siphoneous Algae, with the exception of 

 Vaucheria, possess a celluloso-pectic membrane. 



Chara from Montenegro.l — J. Vilhelm continues his studies on the 

 Char as of Bulgaria and Montenegro, and describes one new species, 

 C. Rolileiiw, and several new forms of existing species. The nearest 

 ally of C. Rohlense is G. gymnophylla. 



Swedish Batrachosp6rmum.§— H. Kylin publishes his studies on the 

 Swedish species of Batrachospermum, and describes a new genus, Sirodotia. 



* Svensk. Bot. Tidskrift, vi. (1912) pp. 447-58 (1 pL). 



t Comptes Rendus, clvi. (1913) pp. 475-7. 



X Hedwigia, liii. (1912) pp. 23 -35. 



§ Nov. Act. E,. Soc. Sci. Upsala, ser. 4, iii. No. 4 (1913) 40 pp. (16 figs.). 



