338 BOTANY. 



2. Physornycetes, including the Mucorini and Saprolegniacece. 



3. Hyphomycetes, including Peronosporece, Penicillium, and many 

 imperfect forms. 



4. Coniomycetes, including Uredinece and Ustilaginece, and in addi- 

 tion a great number of imperfect stages of Ascomycetes. 



5. Ga&teromycetes, as in this book, with the addition of Myxomy- 

 cetes. 



6. Hymenomycetes, as in this book, and including the Tremettini. 



De Bary* arranged Fungi under four groups, as follows : 



1. Phycomycetes. 



Saprolegniacece. Peronosporece. Mucorini. 



2. Hypodermiae. 



Uredinete. UstilagineoR. 



3. Basidiomycetes. 



TremeUini. Hymenomycetes. Gasteromycetes. 



4. Ascomycetes. 



Protomycetes. Tvberacew. Onygenece. Pyrenomycetes. Dte- 



comycetes. 



In both the foregoing arrangements of Fungi the Lichens are omitted, 

 they being regarded as of a different nature. 



(7.) In 1872 Cohn published! an outline of a classification of the Cryp- 

 togams in which the old distinctions between Algae, Fungi, and Lich- 

 ens were abandoned. He considered the Tballophytes as constituting 

 a single class, co-ordinate with Bryophyta, Pteridophyta, and Phanero- 

 gamia, and divided it into seven orders, and each of these into many 

 families ; the latter are in most cases equivalent to what are called 

 orders in this book. The families in Roman contain chlorophyll, those 

 in italics are chlorophyll-less. 



Class Thallophyta. 

 ORDER I. SCHIZOSPORE^I. 



1. Schizomycetes. 2. Chroococcacese. 3. Oscillatoriaceae. 4. Nos- 

 tocaceae. 5. Rivulariaceae. 6. Scytonemaceae. 



ORDER II. ZYGOSPOREJE. 

 1. Diatomaceae. 2. Desmidiaceae. 3. Zygnemaceae. 4. Mucoraceas. 



* In Streinz: " Nomenclator Fungorum," 1861, p. 722, and also in 

 " Morphologic und Physiologic der Pilze, etc.," 1865, preface, p. 6. 



f Ferdinand Cohn, " Conspectus familiarum cryptogamarum secun- 

 dum methodum naturalum dispositarum," in " Hedwigia," February, 



1872. 



