338 BOTANY. 



2. Physomycetes, including the Mucorini and Saprolegniacece. 



3. Hypliomycetes, including Peronosporea, Penicillium, and many 

 imperfect forms. 



4. Coniomycetes, including Uredinem and Ustilaginecz, and in addi- 

 tion a great number of imperfect stages of Ascomycetes. 



5. Gasteromycetes, as in tliis book, with, the addition of Myxomy- 

 celes. 



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



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



1. Phycomycetes. 



Saprolegni'icece. Peronosporece. Mucorini. * 



2. Hypodermiae. 



Uredinem. Ustilaginem. 



3. Basidiomycetes. 



TremeUini. Hymenomycetes. Gasteromycetes. 



4. Ascomycetes. 



Protomycetes. Tuber acece. Onygenem. Pyrenomycetes. Dts- 



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 Algse, Fungi, and Lich- 

 ens were abandoned. He considered the Thallophytes 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^. 



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

 tocacese. 5. Rivulariacese. 6. Scytonemaceae. 



ORDER II. ZYGOSPORE2E. 

 1. Diatomacese. 2. Desmidiacese. 3. Zygnemacese. 4. Mucoracece. 



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

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



f Ferdinand Cohn, ' ' Conspectus f amiliarum cryptogamarum secun- 

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



1872. 



