208 SUMMARY OF CURRENT RESEARCHES RELATING TO 



New Uredine of the Iberian Flora. — R. G. Fragoso {Bol. R. Soc. 

 Espan. Hist. Nat, 1920, 20, ;^>09-10). The new species was found by 

 Professor Caballero on leaves of Lamarckia aiirea near to Barcelona. A 

 diagnosis is given, and a figure showing the numerous swollen paraphyses, 

 a characteristic feature of Uredo Lamarckiae ; they surround the sorus, 

 curving inwards towards the centre. No alternate stage has been dis- 

 covered. A. L. S. 



Observations on the Infection of Crataegus by Gymnosporangium. 

 —J. F. Adams {Mycologia, 1921, 13, 45-9, 4 figs.). The observations 

 were made on a shrubbery growth of hawthorns in Pennsylvania ; with 

 these were also growing Juniper us virginiana, the alternate host of two 

 species of Gymnosporangium. The infection by G. germinale results in 

 modified branches and abnormal hypertrophied buds ; partial defoliation 

 is caused by G. globosum. A list of the hawthorns affected by one or 

 the other of these rusts is given. A.L S. 



Grametophytic Development of Blister Rusts.— J. F. Adams 

 {Bot. Gas., 1921, 71, 181-7, 4 figs.). The author considers the season 

 and the manner of growth of pycnidia and eecidia in these rusts. He 

 finds that there are three types of growth in Peridermium cerebrum. 

 1. The pycnidia appear in spring ; the following spring the fecidia are 

 developed ; in the third season pycnidia again appear. 2. The maturity 

 of the pycnidia precedes the gecidia in adjacent as well as overlying tissue 

 within a period of about six months. 8. The period of development is 

 completed within one growing season, the pycnidia preceding the a^cidia 

 by a varying short period. ' " A. L. S. 



Infection Experiments of Pinus Strobus with Cronartium ribicola. 

 — G. P. Clinton {Report Conn. Agric. Exp. Stat., New Haven, Conn. 

 (1917-18), 1919, 428-59, 8 pis.). The disease, blister rust, due to this 

 fungus was first noted in Connecticut in a plantation of three-year-old 

 seedlings imported from Germany. The alternative host, a Ribes species, 

 was found to be rusted in 1912, also in Connecticut ; since that date it 

 has been reported from various localities. In the present paper Clinton 

 gives results of various culture experiments. He finds that infection of 

 the "pines takes place in the autumn ; pycnidia and pycnidiospores are 

 first developed in the spring ; ascidia are formed later. The tecidiospores 

 are conveyed to Ribes species, and uredo- and teleutosori are formed 

 during the summer. CHnton has also followed the results of infections 

 in the injury caused to the leaves, which become yellow and stunted, 

 and to the stems by producing swelling and discoloration of the tissues. 



A. L. S. 



Rusts on Ribes. — G. P. Clinton {Report Conn. Agric. Exp. Station, 

 New Haven, Conn. (1917-1918), 1919, 423-7). The writer examined 

 plants of Ribes in a number of Herbaria to decide the prevalence of 

 Ribes rusts. He failed to find evidence of the presence of C'ronartivm 

 ribicola, but other rusts were detected as not infrequent — jEcidivM 

 Grossularise was very common, being found on eleven different hosts ; 

 Coleosporium ribicola, a western rust, has been recorded on five species of 



