ZOOLOGY AND HOT ANY, MICROSCOPY, ETC. 683 



Rehm — Ascomycetes exs. Fasc. 48. 



[Specimens 1926-50 are listed, with notes and references.] 



Arm. Mycol., ix. (1911) pp. 286-90. 

 Ricken, Adalbert — Die Blatterpilze. 



[The Agaricaceae of Germany and neighbouring countries, especially Switzer- 

 land and Austria.] 



Leipzig: Oswald Weigel, 1911, lief. 3-4, pp. 65-128 (15 col. pis.). 



Sytz, Walthek — Beitrage zur Kenntniss der Pilzfiora des Kientales. (Contri- 

 bution to a knowledge of the fungus-flora of the Kien valley.) 



[A considerable number of species are listed ; two are new to science — 

 Uromyces Poasalpinse and Coprimes giganteus. 



Mitt. Nattirf. Ges. Bern, 1910 (1911) pp. G4-81 (1 pi.). 



Saccardo, P. A. — Nota? Mycologicae. 



[Notes on microfungi from many localities.] 



Ann. Mycol, ix. (1911) pp. 249-57. 



Sydow, H. & P. — Fungi Africani novi. (New African fungi.) 



[A list of twenty new parasitic species, with a special discussion of Hemileia.~\ 



Engler's Bot. Jahrb., xlv. (1910) pp. 259-65. 

 See also Ann. Mycol, ix. (1911) pp. 302-3. 

 Vuillemin, Paul — Les Isaria de la famille de Verticilliacees (Spicaria et 

 Gibellula). 



[Notes on various apecies of Gibellula, etc.] 



Bull Soc. Mycol France, xxvii. (1911) pp. 75-82 (figs.). 



Lichens. 



(By A. Lorrain Smith, F.L.S.) 



Relation of Siliceous Lichens to the Substratum.* — E. Bachmann 

 studied this subject on granite rocks. He found : 1. That granite is 

 reduced by the lichens comparatively quickly to a clay-like finely 

 granular yellow mass. 2. The lichen particles push from the edge of 

 the granite to the bottom of the small depression in which they are grow- 

 ing and seize with avidity on the mica. More rarely the lichen spreads 

 over the surface of the granite. 3. The spread of the lichen over the 

 rock is directed by the chances of humidity and of gripping the stone. 



Northern Species of Alectoria in America.f — R. Heber Howe 

 has determined ten distinct species of Alectoria that occur in the tran- 

 sitional and Boreal zones. He finds that the genus presents a difficult 

 and complex problem, due to the enormous variations that occur in 

 filamentous lichens, but he insists on taking the broadest view of species, 

 and on allowing the two extremes of variation to stand far apart. Most 

 of the species are European as well as American. Careful descriptions 

 and notes are given of the different species. 



Herre, \V. C. T. — The Gyrophoracese of California. 



[An account of Gyrophora and Umbilicaria, with keys to the species, and 

 descriptions.] 



Contr. U.S. Nat. Herb., xiii. 10 (1911) pp. 313-21 (6 pis.). 



Hesse, 0. — Beitrag zur Kenntniss der Flechten und ihrer charakteristischen 

 Bestandteile. (Contribution to a knowledge of lichens and their characteristic 

 constituents.) 



[Account of acids extracted from various lichens.] 



Journ. praktische Chemie, n.f. lxxxiii. (1911) pp. 22-96. 

 See also Bot. Centralbl, cxvii. (1911) pp. 93-4. 



* Ber. Deutsch. Bot. Gesell., xxix. (1911) pp. 261-73. 

 t Mycologia, iii. (1911) pp. 106-50 (7 pis.). 



