1008 SUMMAUV OF CURRENT RESEARCHES RELATING TO 



Science ftud Art Department, South Kensington. Fig. 1 is drawn from 

 a longitudinal section througli a still green leaf of the wheat, attacked by 

 the fungus in what is termed the Uredo-ivria. In tig. 2 are seen tho 

 details of development of tho uredospores under a higher power. 

 Fig. 3 shows a scries of four successive stages in the germination of 

 the same uredospore, sown in water on glass. Fig. 4 is a longitudinal 

 section through the leaf of a young wheat plant, on which uredospores 

 had been allowed to germinate for 48 hours. In tig. 5 is a group of 

 teleutospores. Fig. 8 shows tiiree of the sporidia germinating in water 

 on glass. Fig. 10 is a transverse section of a leaf of barberry infested 

 with the JEcidium form. Fig. 11 is a portion of a very thin section 

 through a spermogoniura. 



Peronospora viticola.* — According to Sig. G. Cubuni, tliis parasite 

 of the vine occurs in two forms : — (1) " forma palcse," on the flower- 

 stalks either before or after flowering, numerous conidio[)hores appearing 

 through the stomata, and causing the flower or young fruit to perish ; 

 and (2) " forma Lirvata," on the fruit when nearly ripe, bringing about 

 its discoloration and decay ; in tliis form no conidia appear, but the pulp 

 is permeated by the characteristic unicellular mycelium with its globular 

 haustoria and chamber-like prolongations. Infection takes place on the 

 flower-stalks by the conidia formed on the leaves ; tho fungus spreads 

 from them to the berries, and not from the berries backwards on to the 

 ax s. Sexual organs are never found on the fruit. Tho mycelium 

 appears to retain its vitality for a long time in the dead fruits. Tho 

 remedy recommended is copper sulphate, which prevents tho germination 

 of the conidia on the flower-stalks. 



Peronospora of the Rose.t — Sig. G. Cubuni describes Peronospora 

 sparsa, a parasite of the rose, hitherto very rarely seen in Europe. The 

 mycelium has long branched haustoria ; the conidiophores project 

 through the stomata on the under side of the leaf, the leaf-stalk, and 

 the flower-stalk. The hitherto unknown oospores were found in tho 

 sepals. 



Ascophorous form of Penicillium candidum.j — To the species of 

 Penicillium of which the ascophorous form is known, viz. P. glaucum 

 and aureum, Dr. F. Morini now adds P. candidum, grooving on an 

 acorn of Quercns puhesccns. The ascojiliorous hyphfe were only obtained 

 with great difficulty, and Dr. Morini describes in detail several points in 

 which this i)hase diflfers from that in tho two sjiecics named above. 



New Aspergillus. § — Dr. F. Eichelbanm describes a peculiar form of 

 Aspergillus, possibly a new species, from eczema-scales from the human 

 skin. It possesses the peculiarity of presenting all stages of transition 

 between the ordinary mode of formation of the pencils of spores in 

 Aspergillus to the simple abstriction of single conidia from the extre- 

 mities of hyphae. 



Ombropliila and Guepinia.||— M. L. Quelet states that the genus 

 Omhrophila was founded by Fries in 1849, and included two species, 



* Atti Congr. Naz. d. Bot. Critt. Parma, 1887, 20 pp. and 2 pis. See Hedwigia, 

 xxvii. (1888) p. 117. 



t Le staz. sperim. agr. ital., xiv. pp. 295-308 (1 pi.). See Hedwij^ia, xxvii. 

 (18SS) p. 210. X IMalpighia, ii. (1888) pp. 221-34. 



§ SB. Gesell. Bot. Hamburg, Jan. 9, 1888 (1 lig,). See Bot. Centialbl., xsxv. 

 (1888) p. 113. II Morot's Journ. de Bot , ii. (1888) pp. Zlt-^. 



