548 THE PATHOGENIC ALGAE. 



The true Algae may be grouped as follows: (1) Gonjugatae; 

 (2) Clil<>i-(>i>liyceac ; (3) Rhodophyccac ; (4) Phaeojyhyceae ; (5) 

 Characeae. 



Of these the Characeae includes no endophytes, the Gonjugatae, 

 Pliacophyceac, and Rhodophyceae only species endophytic in other 

 algae or in animals. The Ghlorophyceae, however, include a 

 large number of species which live as " aerial algae " endophytic 

 in Phanerogams, either as shelter-parasites or as true parasites. 



i. CHLOROPHYCEAE. 



These are divided into three groups : * 



1. Protococcoideae including the families Volvocaceae, Tetra- 

 sporaccac, Chlorosplwin/n //<\ Pleurococcaccac, Protococcaccae (Endos- 

 />/<('/'t<cct(i\ Characict'c, Sciadiaceae), and Hydrodictyaceac. 



2. Confervoideae including the families Ulvaccac, Ulothricliaceae, 

 Chactoplioraccac Mycoidcaccae, Cylindrocapsaccac, Oedogoniaccae, 

 Coleocliadaceae, Cktdophoraceae, G-omontiaccac, and Sphaeropleaccac. 



3. Siphoneae including the families Botrydiaceac, Phyllo- 

 sipJionaceae, Derbcsiaccac, Vaucheriaccae, Bryopsidaceac, Cauler- 

 paceae, Codiaceac, Vcdoniaccac and Dusyclndaceac. 



Chlorosphaeraceae. 



Chlorosphaera endophyta Klebs. This is found between 

 the living epidermal cells of Lemna minor, and produces there 

 spherical cell-masses visible to the naked eye as wart-like 

 swellings. According to Frank, this is related to Endodonium 

 jxiJi/mor^tlium Frank. 



Entophysa charae Mob. This lives under the cuticle of 

 the epidermal cell- wall of Cltr<i Hornemanni in Brazil. 



Endosphaeraceae. 



Most of the species can penetrate into living organs, but they 

 may also live as saprophytes or vegetate as independent organ- 

 isms. That all the Endosphaeraceae are injurious to their host 

 has not as yet been proved. 



Chlo rocky trium includes eight European species all endophytic 

 in living plants. 



1 The arrangement used by Wille in Engler-Prantl. iiatur. Pflanzen-familien. 



