382 BOTANICAL GAZETTE I November 



dium (4), Niphobolus, Adiantum» Doryopteris, Blechnum, Asplenium (3), 

 Aspidium (4), Polystichum (5), and Gleichenia ; the same author (Bull. Herb. 

 30155.11.2:825-832. 1902), in reporting concerning the collection of Pere 

 Faurie [Filices Faiirieanae) from Korea, has described new species of 

 Athyrium (2) and Aspidium, — C, L. Pollard (Proc. Biol. Soc. Washington 

 15:201-203. IQ02) has described two new violets from the eastern United 



States. 



Western 



revision of Allium as represented in the Great Basin and adjoining regions, 

 including 3 new species; has presented the Nyctaginaceae of the Great 

 Plateau, including new species pf Boerhaavia (2) and Acleisanthes ; has 

 described new species of Leptotaenia and Gilia; and has revised the nomen- 

 clature of a number of species of Astragalus, including descriptions of 4 new 

 species.— B. Fedtschenko (Acta Hort. Petrop. 19 : 183-349, 1902) has pub- 

 lished a detailed revision of Hedysarum, recognizing 78 species, of which 3 

 are new. — J, M, C. 



In jhe present paper Neger^^ has extended the ecolo<^ical studies 

 begun on Phyllactinia to the whole family of the Erysipheae. Very interest- 

 ing data are given as to the methods of attachment, as also the setting free 

 and distribution of the perithecia, and the scattered observations of a number 

 of authors are brought together and summarized. The perithecia of Sphaero- 

 iheca and Erysiphe are not spontaneously set free from the substratum, and 

 the appendages here serve for attachment. On the other hand, the per- 

 ithecia of Podosphaera, Trichocladia, Microsphaera, and some Uncinulas are 

 broken loose as a result of unequal shrinkage of the upper and under walls 

 of the perithecia in drying. This makes the ripe and dry perithecium either 

 flat or concave on its under side, as has also been observed by Galloway. 

 Just how this deformation leads to the setting free of the perithecia is perhaps 

 still not clear. The interlacing of the appendages serves to hold adjacent 

 perithecia together so that they fall from the host leaf in masses rather than 

 singly. In Phyllactinia the perithecia are set free by the bending downwards 

 of the spine-like appendages which thus lift up the perithecium from the sur- 

 face of the leaf. The author also discusses the question as to the causes which 

 lead to the formation of the sexual and asexual fruit organs, and concludes 

 that the conidia are favored by a fresh vigorous condition of the host plant, 

 while the perithecia are more likely to be formed in well developed mycelia 

 on mature parts of the host, which, however, must not have been already 

 exhausted by a too abundant crop of conidia. 



The earlier paper ^^ describes very extensive germination experiments 

 and studies on the form, length, irritability, etc., of the germ tubes of the 



'-•Neger, F. W., Beitrage zur Biologie der Erysipheen. Flora 88: 333-370- 

 ph. 16-17, 1 90 1, 



« 



»5Neger, F, W,, Zur Kenntniss der Gattung Phyllactinia, Bcr. Deutsch. Bot. 

 Gesell. 17: 235. 1899. 



