Feb., 1901] Kellerman — Botanical Literature. 63 



NOTES FROM BOTANICAL LITERATURE. 

 W. A. Kellerman. 



A very interesting Bulletin of eight images on the Chrysanthemum 

 Rust has been issued by J. C. Arthur, botanist of the Indiana Agri- 

 cultural Experiment Station. It is No. 85, and is dated October, 

 1900. Dr. Arthur gives a general account of Uredineae or Rusts,, 

 explaining that the typical forms have three pi'ominent sets of 

 spores, namely (1) aecidiospores, usually red or orange in little white 

 cups, (2) uredospores, generally of a rusty yellow color and abundant 

 (hence the group name. Rusts), and (3) teleutospores, or the Winter 

 spores, usually dark brown or black. He further states that only 

 uredospores have yet been found in Europe and America, and since 

 the fungus is an annual, it is puzzling to see how it escapes extermi- 

 iiation^^in winter and spring when Chrysanthemum plants are latent. 



The assumption that this was the well known and common 

 Puccinia hieracii or Puccinia tanaceti he proves to be incorrect by 

 inoculation experiments. Uredospores from Chrysanthemums he 

 sowed on Chrysanthemums and obtained a crop of uredospores. 

 Similar uredospores sowed on Dandelion, Burdock, and Ox-eye 

 Daisy produced no infection ; uredospores from the latter hosts sown 

 on Chrysanthemum likewise produced no infection. Uredospores 

 from Dandelion sown on Dandelion produced uredospores. Others 

 have tried similar experiments,* using Tansy, Costmary, Orange 

 Hawkweed, Giant Daisy, and Marguerite, besides the host plants 

 named above, but the Chrysanthemum Rust refuses to grow on any 

 of them. This Rust, which is common and well known on the 

 Chrysanthemum in Japan, has been named Puccinia clirysanthemi 

 by Rose. 



Infconnection with suggestions relative to combating the disease, , 

 Dr. Arthur says that ''so long as the teleutospores do not make an 

 appearance in this country, the careful cultivator may feel assured 

 that a moderate amount of timely effort will enable him to rid his 

 establishment of the Rust, if he is so unfortunate as to have it 

 donatedlto himjby some careless florist. Observations made by the 

 writer and others show that the tendency is for the disease to dis- 

 appear of itself, to run its course in an establishment and die out, 

 which is very likely to some extent due to the absence of teleuto- 

 spores." 



Bryology. — Mrs. Britton's popular articles on the Mosses and 

 how to study them, that have appeared from time to time, furnished 

 the directions and incentive to many who before had taken little or 

 no interest in this group of plants. Her purpose and plan are imi- 

 tated and extended in a charming little book, that has been prepared . 



