ZOOLOGY AND BOTANY, MICROSCOPY, ETC. 345 



has found biolosrical forms iu the Puccinke of the Labiatfe. Other 

 forms have been found to infest a large series of plants, such as 

 Puccinia Isiacce, the teleutospores of which are to be found on Phrag- 

 mites communis, as also on plants of Cruciferse, Capparidace^e, Caryo- 

 phyllaceaj, Chenopodiacea^, tJmbelliferffi, Yalerianaceaj, Borraginaces, 

 Ijabiata3, and Scrophulariace*. 



Fischer * also criticises Arthur's new classification of Uredineae, 

 and his invention of a new terminology. Arthur has laid great stress 

 on the position of the spore-layer in the tissue of the host — whether 

 in the superficial tissue or deeper in the mesophyll. He has also 

 grouped the genera in tribes, according to the numljer of spore-forms 

 developed in each plant. Fischer questions the value of his deductions ; 

 as, for instance, when he makes the presence or absence of the u^cidium 

 a leading character in determining the place of the plant in his system. 

 It has been proved that the presence of JScklia is largely a matter of 

 climate. He finds, also, that the position in the tissue of the host- 

 plant is a specific distinction, and not so important as Arthur would 

 have it. Further, he disapproves of Arthur's substitution of new terms 

 for old, finding them unnecessary. 



Paul Cruchett continues his examination of the Puccinice that 

 infest Labiatse. He finds a new species with its j^cidiimi on Prunella, 

 the Puccinia form of which grows on Molinia cocrulea, which he calls 

 P. Brunellarum-Molinice,. Two other species are given as growing on 

 Molinia, viz. P. nemoralis and P. Molinice,, but he has decided that the 

 new species has nothing to do with these forms. He experimented 

 also with P. Stipce, with Thymus vulgaris, as a new host for the ^ci/Uum, 

 with P. Glechomatis, P. annularis, and P. Stachydis, the latter belong- 

 ing to the group of Brachypuccinis, with two possible hosts, Stachys 

 recta and S. annua. The paper is illustrated by a plate and figures of 

 the teleutospores, and by tables showing the different experiments. 



Frank D. Kern | supplies notes on the methods employed in experi- 

 menting on Uredinete. All grass and sedge-rusts are hetercecious, 

 and teleutospores from these plants afford good culture material. He 

 gives advice as to the date of collecting the spore material, the method 

 of preserving it during the winter, and the best time for infection 

 experiments. If scidiospores are to be used, the leaves bearing the 

 jEcidia are suspended over the host so that the spores may fall on the 

 leaf. In all cases, the host-plant should first be moistened by spray- 

 ing. In the case of teleutospores and uredospores, they are directly 

 cut from the sorus and applied to the leaf. The author directs how 

 care should be taken to prevent other infections than the one intended, 

 and to secure the most favourable conditions for the development of the 

 fungus. 



Guy West Wilson § has made a study of the rusts that occur in some 

 of the Indiana counties. He signalises twelve of the species as 

 injurious, as they infest cultivated plants. Among these are the 

 grain-rusts Dicceoma poculiforme and D. Rhamni, the blackberry rust 

 Gymnoconia interstitial is, with other rusts of clover, corn, asparagus, etc. 



* Bot. Zeit.,tlxv. (1907) pp. 54-9. 



t CentralbL^Bakt., xvii. (1906) pp. 497-505 and 674-84 (1 pi. and 5 figs.). 



X Indiana Acad. Sci., 1905, pp. 127-31. § Tom. cit., pp. 177-82. 



June 19th, 1907 2 A 



