Algae. — Eumycetes. 243 



parietale adest in unaquaque cellula, pyrenoide unico centrali prae- 

 ditum. Multiplicatio ut in genere." 



Varietes nouvelles: Coelastnim cambricum Arch. var. inappen- 

 dicidatum, Scenedesmus acutiformis Schroed. var. bicaudatus, Te- 

 traedron tetragonum (Näg.) Hansg. var. siibtetvaedricuni. 



Sont aussi ä signaler quelques observations que l'A. a fait en 

 suivant les phases de la reproduction du Gloetaenium Loitlesberge- 

 rianiim Hansg. G. B. Traverso (Padova). 



Betts, A. D., ABee-hive Fungus. Pericxstis alvei, Gen. et S p. 

 nov. (Ann. Bot. XXVI. p. 795—799. 2 pl. July 1912.) 



The author describes a fungus which is regarded a normal 

 inmate of the bee-hive. It grows on the pollen stored in the combs, 

 and is che principal constituent of the pollen-mould prevalent in 

 hives during winter and early spring. The fungus produces chlamy- 

 dospores (terminal and intercalary) and also large dark green "cysts" 

 which contain numerous spores. The chlamydospores are capable 

 of immediate germination, but the cyst-spores apparently require a 

 period of rest. The fungus, which is considered to represent a new 

 genus, is named Pericystis alvei. A. D. Cotton. 



Betts, A. D., The Fungi ofthe Bee-hive. (Journ. Econ. Biol. 

 VII. 4. p. 129—162. 25 fig. Dec. 1912.) 



An account is given of previous work which has been done on 

 the fungi in bee-hives, and some questions arising from these re- 

 cords are discussed. A general description of the conditions pre- 

 vailing in the hive and of the distribution of fungus growth in it, 

 are given. 



Of the 12 species of fungi described, Oospora favorum, and 

 Pericystis alvei are probably confined to bee-hives. The former is 

 rare, but the latter which has not been met with outside the hive, 

 is common. Gymnoascus setosus and Eremascus fertilis are found to 

 be adapted to hive-life, but they are not confined to this habitat, 

 the former being recorded from the nests of other Hymenoptera. 

 Several other species are also frequently found , but are not spe- 

 cially adapted for life in the hive. A. D. Cotton. 



Blackman, V. H. and E. J. Welsford. The Development ot 

 the Perithecium of Polystigma- rubrum DC. (Ann. Bot. XXVI. 

 p. 795—799 July 1912.) 



Polystigma rubrum like so many of the Ascomycetes does not 

 have a normal sexual process. It produces well-marked male and 

 female organs, but both are abortive. The spermatia are also func- 

 tionless, and in some cases show signs of nuclear disorganisation 

 while still within the spermogonium. 



The ascogonia are coiled multicellular structures without tricho- 

 gynes, and disorganise without producing ascogenous hyphae. Nu- 

 clear fusions occur in the asci and there is some evidence of earlier 

 nuclear fusions in the ascogenous hyphae at the time of their diffe- 

 rentiation. Vegetative hyphae often push outwards through the sto- 

 mata, but they have no continuity with the ascogonia and cannot 

 be regarded as trichogynes. E. J. Welsford. 



