CLASSIFICATION OF THALLOPHTTES. 339 



ORDER III. BASIDIOSPORE^B. 



SECTION 1. HYPODERMIC. 

 1. UredinacecB. 2. Ustilaginacece. 



SECTION 2. BASIDIOMYCETES. 



3. Tremellacece. 4. Agaricacece (Hymenomycetes)^ 5. Lycoperdacece 

 (Gasteromycetes). 



ORDER IV. ASCOSPORE.E. 



1. Tuberacece. 2. Onygenacece. 3. ErysipJiacecK. 4. Sphwriacea} (Py- 

 renomycetea). 5. Helvellacece. 6. Lichenes (excluding Collemaceae). 



ORDER V. TETRASPORE^} (FLORIDE^:) 



1. Bangiacese. 2. Dictyotaceae. 3. Ceramiaceae. 4. Nemaliaceae. 

 5. Lemaniaceae. 6. Sphasrococcaceaa 7. Melobesiacese. 8. Rhodo- 

 melaceae. 



ORDER VI. ZOOSPORE^. 



1. Palmellaceaa. 2. Confervaceae. 3. Ectocarpeaa. 4. Sphacelari- 

 acea?. 5. Sporochnaceaa. 6. Laminariacese. 



ORDER VII. OOSPORE^J. 

 SECTION 1. LEUCOSPORE^E. 

 1. ChytridiacecB. 2. Peronosporacece. 3. Saprolegniaceee. 



SECTION 2. CHLOROSPORE^E. 



4. Volvocaceae. 5. Siphonaceaa. 6. Spliaeropleaceae. 7. (Edogoni- 

 aceaa. 8. Coleochaataceae. 



SECTION 3. PII^EOSPORE^:. 

 9. Tilopteridese. 10. Fucaceaa. 



(8.) In 1873 Fischer proposed an arrangement* of the Thallophytes 

 which in many respects is like that of Sachs. Like the latter, Fischer 

 divides the Thallophyta (co-ordinate with Cormophyta) into four 

 classes, composed in each case of chlorophyll-bearing and chlorophyll- 

 free plants, the algaa and fungi. Instead, however, of considering the 

 fungi as degraded forms, he regards them as constituting with the 

 algae two parallel but entirely distinct genetic lines. The Myxomy- 

 cetes he places in a third genetic line, nearest to, but still distinct from, 

 the fungi. 



* Given in Sachs' " Lehrbuch," fourth edition, p. 248. The groups 

 given under each class are of very unequal value. 



