ZOOLOGY AND BOTANY, MICROSCOPY, ETC. 753 



be recommended because so little of the lichen thallns is required for 

 the experiment. Details are given of the experiments. 



Jatta, A. — Species novae in excelsis Ruwenzori in expeditione Ducis Apruti 

 lectae. IV. Lichenes. Lichens from Ruwenzori.) 



[Among the lichens collected by the expedition of the Duke of the Abruzzi 

 are several new species.] Ann. Bot., vi. (1908) pp. 407-9. 



See also Bot. Centralbl, cviii. (1908) p. 188. 



Kernstock, E. — Index nominum receptorum et synonymorum Lichenographiee 

 Scandinavicae Friesianae. 



[An index of Th. Fries's work on Scandinavian lichens.] 



Ann. Mycol., vi. (1908) pp. 230-67. 



Zahlbruckner, A. — Beitrage zur Flechtenflora Brasiliens. (Contributions to 

 the lichen flora of Brazil.) 



[Several new species are included in the list.] 



Bull. Herb. Boiss., ser. 2, vii. (1908) pp. 459-68. 



Zachacke, Hermann — Beitrage zn einer Flechtenflora des Harzes. (Contri- 

 butions to a lichen flora of the Harz.) 

 [A list of species found by the writer.] 



Hedwigia, xlviii. (1908) pp. 21-44. 



Mycetozoa. 



(By A. Lorrain Smith, F.L.S.) 



Spongospora Solani.* — T. Johnson regards this organism as a slime- 

 fungus akin to Plasmodiophora. It causes scab of potato tubers and 

 very seriously damages the crops in many districts. The scabbed areas 

 of the tuber are inhabited by spore-balls which escape into the soil ; 

 these spores produce motile amoeboid bodies, which form a plasmodium 

 and pass to the newly planted tuber. Johnson warns growers of the 

 serious nature of the disease and suggests remedies : clean seed, proper 

 rotation of crops, dry soil and steeping the seed-tubers before planting in 

 Bordeaux mixture. 



Development of the Sporangia in Trichia and Arcyria.f — Helene 

 Kranzlin has been applying new and improved methods of technique to 

 the elucidation of problems connected with the Mycetozoa. In Arcyria 

 the development of the sporangia takes place by a heaping up of the 

 plasma, first in roundish then cylindrical masses ; the plasma in the 

 younger stages is thick externally with vacuoles in the interior. Large 

 nuclei in process of division were to be seen at the first stage of sporan- 

 gium formation. As the cylindrical form takes shape the nuclei of the 

 outer layers become more closely associated and fuse in pairs ; later the 

 central nuclei fuse also. The author discusses the views about reduction 

 of the chromosomes which number eight in the fused nucleus, and she 

 also gives notes on the formation of the elaters. 



* Econ. Proc. Roy. Dublin Soc, i. (1908) pp. 453-64 (1 pi.), 

 t Arch. Prot. Kunde, ix. (1907) pp. 176-94 (1 pi. and 7 figs.). See also Bot. 

 Centralbl., cviii. (1908) pp. 180-1. 



