54 MORPHOLOGY AND TAXONOMY OF FUNGI, ETC. [Box. Absts., Vol. VII, 



368. Namyslowski, B. Etat actuel des recherches sur les phenomlnes de la sexuality 

 des Mucorinees. [The status of researches on sexuality in the Mucorineae.] Rev. G6n. Bet. 

 32: 193-215. 9 fig. 1920. — A summarj' of the results of experimental researches on reproduc- 

 tion and hybridization in this group of fungi. A bibliography of 34 titles is appended. — 

 L. W. Sharp. 



369. Rick, J. Contributio ad monographiam Agaricacearum brasiliensium. [Contribu- 

 tion toward a monograph of Brazilian agarics.] Broteria (Ser. Bot.) 18:48-63. 1920. — This 

 list contains 106 species and a few varieties, without citation of authorities except for new 

 species, apparently all from the province of Rio Grande do Sul. In case of species already 

 described, only a line or two of notes appear. In case of new species the descriptions are 

 more complete. Of these the author says: "In this contribution many species are described 

 whose identity with European species is quite probable, but not certain. I have therefore 

 given a full description and a new name. At the same time I have indicated the old species 

 with which the new is perchance identical." New species are proposed in Lepiota, Hypho- 

 loma, Armillaria, Tricholoma, Collybia, Pluteolus, Eccilia, Clitopilus, Claudopus, Inocybe, 

 Nauconia, Galera, Tubaria, Pilosace, Psilocybe, and Hygrophorus. [See Bot. Absts. 6, 

 Entry 20i.]—E. B. Chamberlain. 



370. Thaxter, Roland. New Dimorphomyceteae. Proc. Amer. Acad. Arts and Sci. 

 55: 211-282. 1920. — The author discusses in general the unisexual forms of the Laboul- 

 beniales and in particular the distinction between the genera Dimeromyces and Dimorpho- 

 myces. Polyandromyces is described as a new genus with one species and a variety as the 

 known representatives. Eleven new species of Dimeromyces and fifty-one new species of 

 Dimorphomyces are described. — E. B. Payson. 



LICHENS 



371. MoREAU, F. (M. ET MME.) Recherches sur les lichens de la famille des Pelti- 

 geracees. [Researches on lichens of the family Peltigeraceae.] Ann. Sci. Nat. Bot. X, 1: 

 29-138. 13 pi., 23 fig. 1919. — Authors are especially interested in reproduction of fungus of 

 the lichen and in morphological influence of one symbiont on other. Their presentation is in 

 three parts: (1) the fungus, (2) the alga, and (3) the alga-fungus complex. Authors empha- 

 size mycelium as constituting colorless part of lichen. Underground or substratal mycelium 

 is typical and generally neglected by students; authors call attention to occasional fusions 

 among underground hyphae and to evidence for method of formation of septa. Typical 

 mycelium appears also in the gonidial layer. Each cell is here described as having a single 

 nucleus and metachromatic granules. In considering medullary region and pseudoparenchy- 

 matous region (plectenchyma), character of walls is emphasized. Authors refer to two 

 kinds of reproductive bodies set free by Peltigeraceae; viz., spermatids and ascospores. They 

 note that status of spermatids is uncertain. They found spermatids only in genus Nephro- 

 mium, but did not make out fate of spermatids after being set free. Their studies showed 

 that ascospore formation proceeds in absence of spermatids, and they deny to latter gametic 

 functions. Ascospores an uncertain means of maintaining species, since a proper alga must 

 be met when spore germinates. Soredia are certain to lead to new lichens. A consideration 

 is next presented of beliefs of Stahl and Bachmann, of FuNFSTtTCK, and of Dangeard con- 

 cerning occurrence of sexual phenomena at formation of apothecia in fungi, and hypothesis 

 of Dangeard is favored. — Authors point^ out that the kind of alga (gonidia) whether of 

 Cyanophyceae or Chlorophyceae, determines sub-generic groups in each of three genera of 

 Peltigeraceae. Chlorophyceous Peltigeraceae may enclose Cyanophyceae in cephalodia. 

 The authors point out necessity of pure culture methods in study of lichen algae. — Mutual 

 relationships of alga and fungus studied in following exceptional formations which begin 

 with algae in unusual positions: (a) tubercles resembling very large soredia on lower sur- 

 face of thallus (displaced gonidia cause neighboring hyphae to assume special character); 

 (b) soredial aberrations; (c) foliar ramifications of thallus, and (d) cephalodia formation 

 due to action on hyphae of foreign alga. — Desirable further lines of study are mapped out 

 at close. — James P. Kelly. 



