196 Algae. — Eumycetes. 



to each increases in the lower associations and the algae are larger 

 in the lower associations. The different groups of algae are not 

 restricted to any definite associations. Harshberger. 



Transeau, E. N., The Periodicity of Fr esh water Algae. 

 (Amer. Journ. Bot. III. p. 121 — 132. Mch. 1916.) 



The main points in this paper may be summarized by using 

 the words of the author, as follows: Although algae germinate, de- 

 velop vegetatively, and produce spores throughout the year, they 

 may be grouped conveniently, on the basis of their complete life 

 histories into winter annuals, spring annuals, summer annuals, 

 autumn annuals, ephemerals and perennials. Four distinct periods 

 may be recognized in the life history of most fresh-water algae: 

 germination, vegetative development, reproduction and dormancy. 

 The great majority of zygospores, oöspores, and aplanospores ger- 

 minate in the spring there is germination going on however at all 

 times and a secondary maximum occurs in autumn. The factors 

 involved in the germination of spores are probably as numerous 

 as those initiating germination of seeds. Temperature, light inten- 

 sity, concentratiorr and mineral content of water accelerate or retard 

 the approach of the reproductive period. The periods of most 

 abundant fruiting of algae correspond with the periods ofhighwater 

 level. Other points are emphasized and 3 graphic figures illustrate 

 the paper. Harshberger. 



Höhnel, F. von, My kologisch es. XXIV. Vorläufige Mit- 

 teilungen. (Gestern bot. Zeitschr. LXVI. N" 1/2 p. 51—60. 

 NO 3/4 p. 94—112. 1916.) 



Die systematischen mykologischen Studien des Verf. werden 

 in den Sitzungsberichten der Wiener ksl. Akademie der Wissen- 

 schaften unter dem Titel „Fragmente" regelmässig publiziert. Da 

 sie aber rascher vor sich gehen als ihre Drucklegung erfolgen 

 kann, macht Verf. auf die wichtigsten Ergebnisse der letzten Zeit 

 früher aufmerksam u.zw. in der vorliegenden Schrift. Es werden 393 

 Angaben gemacht, die hier nicht wiedergegeben werden können. 

 Einige Beispiele: 



Ällantosphaeriaceen von Höhnel. Die Gliederung ist folgende: 



I. Diatrypeen v. H. (non Aut). 



1. Cryptosphaeria Grev. (^ Massalongiella Speg.). 2. Quaterna- 

 ria Tul. 3. Eutypa Tul. 4 EutypeUa Ntke. 5. Dintrype Fries. 



6. Dintrypella Ces. et de Not. (r= Cryptovalsa Berl. p. p.). 



7. Cryptovalsa Ces. et de Not. (non Berl.) (= AUescherina 

 Berlese). 



II. Calosphaerieen v. Höhn. 



1. Pleurostoma Tul. (= Neoarcangelia Berlese). 2, Enchnoa 

 Fr. 3. Romellia Berlese. 4. Erostella Sacc. (== Togninia Ber- 

 lese). 5. Jattaea Berl. 6. Wegeltma Berl. 7. Calosphaeria Tul. 



III. Valseen v, H. non Aut. 



1. Valsa Fries p. p. {Euvaha -j- Leucostoma). 2. Scoptria Ntke 

 (= Peroneutypa Berl. r= Peroneutypella Berl.). 3. Val- 

 sella Fuck. 



IV. Coronophoreen v. H. 1. Coronophorella v. H. 2. Cryptosphae- 

 rella Sacc. v. H. 3. Coronophora Fuck v. H. 4. Frac- 

 chiaea Sacc. 



