No. 2, December, 1921] MORPHOLOGY AND TAXONOMY, FUNGI, ETC. 99 



as the former organism produces 8.30-9.15 per cent alcohol. Both organisms, when grown 

 together with Saccharomyces ellipsoideus, grow more rapidly than the latter at the start, but 

 are overcome v/hen the alcohol content of the fermenting mixture has reached the point of 

 maximum endurance, after which S. ellipsoideus continues the fermentation practically alone. 

 Neither organism induces a noticeable variation in the normal course of the fermentation by 

 S. ellipsoideus nor do they produce compounds which are deleterious to the taste of the 

 wine. — A. Bonazzi. 



625. Weiss, H. B. Diptera and fungi. Proc. Biol. Soc. Washington [D. C] 34: 8.5-88. 

 1921. — Attention is called to the relationship between certain Dipterous families, chiefly 

 Mycetophilidae and Platypezidae, and the fleshy fungi, particularly the families Agaricaceae 

 and Polyporaceae. Lists of the insects and the fungus hosts upon which they have been found 

 are given. — J. C. Gilman. 



LICHENS 



626. BioRBT, G. Revue des travaux parus sur les lichens de 1910 i 1919. [Review of the 

 published work on lichens from 1910 to 1919.] Rev. G6n. Bot. 33: 63-76, 140-160, 214-220, 

 264-272, 32S-336, 372-396. 1921. 



627. MoREAU, F. KT Mme. iMoREAu]. Les differentes formes de la symbiose lichenique. 

 Chez le Solorina saccata Ach . et le Solorina crocea Ach . [Different kinds of symbiosis among the 

 lichens. The case of Solorina saccata Ach. and S. crocea Ach.] Rev. Gen. Bot. 33: 81-87. 

 PI. SS, 1921. Three degrees of symbiotic relation are reported between the fungus and 

 alga in the case of Solorina saccata and S. crocea. In the 1st case, that of the external 

 cephalodia of S. saccata, the alga, foreign to the lichen but accidentally brought in contact 

 with it, brings about a defensive action on the part of the lichen. The alga becomes 

 surrounded by the lichen and its progress is thus limited. In the 2nd case, that 

 of the internal cephalodia of S. saccata, the alga is accepted within the tissues of the 

 fungus, but not without certain limitations, as is evidenced by the frequent occurrence of 

 dead algae. In the 3rd case, that of the internal cephalodia of S. crocea, the alga is received 

 into intimate relations with the lichen and reaches therefore a larger development. The alga 

 in this case may form a secondary gonidial layer below the usual gonidial layer of the lichen. 

 The differences among these types are due to the degree of tolerance which occurs between 

 the 2 organisms. — /. C. Gilman. 



628. MoXLBT, George L. Some vacation lichens. Bryologist 24: 24-25. 1921. — The 

 author gives a list of 31 species of lichens collected in the Topanga Canyon region, Southern 

 California. Brief notes accompany the list, and there is a running account of the region 

 and the general collection. — E. B. Chamberlain. 



629. Watson, W. [Rev. of: Smith, Annie Lorrain. A handbook of the British lichens. 

 158 p., 90 fig. British Museum: 1921.] Jour. Botany 59: 180-182. 1921. 



630. ZscHACKE, H. Die mitteleuropaischen Verrucariaceen. III. [The Verrucariaceae 

 of central Europe III.] Hedwigia 62: 90-154. 1921. — This 3rd paper treats the genus TheU 

 idium. A 5-line diagnosis of the genus is followed by a long discussion of generic characters. 

 Fifty-two species, 21 with immersed and 31 with semi-immersed perithecia, are treated, in- 

 cluding keys, diagnoses, citations of exsiccatae and discussions of distribution, habitat and 

 synonymy. Thelidium circumvallatum, T. wettinense, and T. austriacum are described as 

 new. Several subspecies and forms are listed with short diagnoses; some of these are de- 

 scribed as new. — Bruce Fink. 



MYXOMYGETES 



631. Elliott, W. T. Mycetozoa on the Midland Plateau. Jour. Botany 59: 193-196. 

 1921. — The author lists 121 species and varieties of slime molds for Warwickshire, Worcester- 

 shire, and Staffordshire. — .S. H. Burnham. 



