380 SUMMARY OF CURKENT RESEARCHES RELATING TO 



cetes, and on to the lower forms of the Euascomycetes, such as Monascus^ 

 Gymnoascus, etc. He also suggests the different lines of development 

 within the group. A full bibliography is appended. A. L. S. 



Minimum, Optimum, and Maximum Temperatures of Spore 

 Germination in some Uredinales. — Wm. I). Doran {PJtijtopathology, 

 1919, 9, 391-402). The spores tested were the secidiospores and 

 urediniospores of Cronartium ribkola, aecidiospores of Gymnosporan- 

 gium davlpes, urediniospores of Puccinia Antirrhini and of Uromyces 

 caryophyUinus, and the teleutospores of P. malvacearum. The various 

 results are recorded. It was found that these spores germinated over a 

 wide range of temperature, but that there is a material degree of host- 

 infection only when the temperature is near the optimum, and that 

 temperature is relatively low. Apparently there exists a relation between 

 the time of year when spores occur and the optimum temperature for 

 their germination. A. L. S. 



Undescribed Timber Decay of Hemlock. — Erdman West {Myro- 

 logia, 1919, 11, 2G2-6). PoJyporus Tsugse, which causes the decay of 

 hemlock timber, is at first a sap-rot, but it eventually destroys the heart- 

 wood also. Few stumps or dead trunks escape its attack. West gives 

 an account of the action of the fungus on the host tissues, and he gives 

 a revised diagnosis ; he rejects Lloyd's statement that it is a form of 

 P. lucidus. A. L. S. 



Pineapple Fungus, or Enfant du Pin or Warabou. — J. H. 

 Faull {MycoJogia, 1919, 11, 2(J7-72). An account of Fomes officinalis, 

 which grows on various conifers. It was valued by the Indians for its 

 medicinal properties. It has been used by early settlers in the making 

 of home-brewed beer, and as a substitute for hops in the making of 

 yeasts. A. L. S. 



Some described Species of Poria. — W. A. Murrill {Mycohgia, 

 1919, 11, 231-44). An account is given of American species of the white 

 or brightly coloured resupinate Porise ; care is necessary to distinguish 

 between true resupinate and the resupinate growth of some pileate 

 Polypores. Murrill has examined and described thirty-five species. As 

 a rule it is only possible to give size and measurements of the pores, as 

 in most cases spores are lacking. A. L. S. 



Some Colorado Fungi. — L. D. Overholts [Mycologia, 1919, 11, 

 243-58). Very Httle work has as yet been done on the larger fungi of 

 the -Western American States. Overholts has been working in this 

 region for some seasons, and he now publishes 152 different plants ; 

 they comprise Ascomycetes, Basidiomycttes, and a few Uredineie. He 

 has given notes on the climatic and soil conditions, and the way that 

 these affect the occurrence of fleshy fungi. A. L. S. 



Fungi as Members of the Subserial Transmigration. — A. H. 

 Church (" Thalassiophyta and the Subserial Transmigration,'" Bot, 

 Memoirs^ No. 3, 1919, 48-64). Church considers that the great 

 majority of plants included under Fungi are derived from phytobenthon» 



