242 Neue Litteratur. 



deeply constricted at middle, leaving a wide angle; semi-cells three- 

 lobed, angles bifid, furnished with a strong spine. Polar lobe rnuch 

 attenuated, and having the spines rather longer. This distinct and 

 remarkable species appears to bear the nearest relation to Micrasterias 

 arcuata Bail. and M. ascendens Nordst. , but at first sight I was in 

 some doubt whether its true position miglit not be with the Staurastrae. 

 Membrane smooth , length (s. acul.) 27 fx , breadth (s. acul.) 55 fi; 

 thickness 27 ^w, breadth of isthmus 20 fi, width of polar lobe (s. acul.) 

 30 /i. Rangoon, British Burmah, 1883. — Xanthidium antilopeum 

 (Breb.) Kütz. , new var. Canadense. — Arthrodesmus gibberulus n. sp. 

 Medium size , cells elliptic with sträng convergent spines ; without 

 spinps about aa long as wide , membrane smooth , cells with large 

 inflation at the upper side , giving theni in the eud view an almost 

 spherical appearance. Rangoon, British Burma. Length 36 ^w, breadth 

 (s. acul.) 35 fx (s. acul.) 54 ^u, thickness 25 jU, breadth of isthmus 13 //. 

 — Staurastrum minusculum n. sp. Very minute , smooth , semi-cells 

 subcuneate with rounded ends, slightly convex; angles jjroduced laterally 

 into straight diverging arms, rather longer than the diameter of cell, 

 surmounted by four aculeate spines set at right angles. Nearest to 

 S. gracile Ralfs , but diii'ering in its smaller size and forked apices. 

 Length of arm 12.13^, diameter of cell 10//. Rangoon. — Cosmarium 

 Turpini Breb. nov. var. Cambricum. Bangor , N. Wales, 1881. — 

 Penium spinospermum n. sp. Small , about two and a quarter times 

 longer than wide, subcylindrical, with a very slight median construction ; 

 apices round, very slightly attenuated ; membrane smooth ; zygospores 

 in young state globose and smooth, when mature thickly covered with 

 obtuse projections. Length 33 fx , breadth 25 fA, , breadth of zygospore 

 (s. acul.) 23 fx , length of processes 71/2 ,". Devrystrasna Bog, Co 

 Armagh, Ireland. Rev. H. W. Lett.] 

 Wildemau, E. de, Contribution ä l'etude des Algues de Belgique. (Comptes- 



Rendus des seances de la Societe royale de botanique de Belgique. 1885. 



p. 20.) 



Pilze : 



Smith , W. Cr. , Parasite of Henbane , Peronospora Hyascyami P. (The 



Gardeners Chronicle. New Series. Vol. XXllI. 1885. No. 580. p. 176.) 

 Vau Tieghem , P. , Culture et developpement du Pyronema conüuens. 



(Bulletin de la Societe botanique de France. T. XXXI. Comptes rendus. 



No. 7.) 



Flechten : 

 Arnold, F., Die Lichenen des fränkischen Jura. [Fortsetzg.] (Flora. LXVIII. 



1885. No. 4. p. 49.) 



Muscineen : 

 Hobliirk, Chas. P., Notes sur Trematodon ambiguus. (Comptes-Rendus des 



seances de la Societe Royale de Botanique de Belgique. 1885. p. 23.) 



Gefässkryptogamen : 



Baker, J. G., A Synopsis of the Genus Selaginella. [Contin.] (Journal of 

 Botany. Vol. XXlIl. 1885. No. 266. p. 45.) 



[Enthält folgende neue Arten : S. breynioides n. sp. Mountains of 

 Navite, Levu, Fiji, Milne 198! 334. — S. obesa n. sp. North Borneo, 

 Burbidge. — S. hordeiformis n. sp. Fiji Islands, Macleay. — S. 

 nitens n. sp. Fernando Po, Mann. Cameroon Mountains, Kalbreyer. 

 A near ally of S. flabellata.] 

 Franeliet, A., Isoetes Savatieri sp. n. (Bulletin de la Societe botanique de 

 France. T. XXXI. Comptes rendus. No. 7.) 



Physiologie, Biologie, Anatomie und Morphologie : 



Bauer, Ueber den aus Agar-Agar entstehenden Zucker, über eine neue Säure 

 aus der Arabinose nebst dem Versuche einer Classification der gallert- 

 bildenden Kohlehydrate nach den aus ihnen entstehenden Zuckerarten. 

 (Journal für praktische Chemie. N. Folge. Bd. XXX. No. 8/9.J 



