548 THE I'ATHOdKNIC ALGAE. 



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

 (2) Chloroiihycmr ; (3) Rhodophyccac \ (4) Phaeox>hyccac \ (5) 

 Gharaccae. 



Of these the Characcac includes no endophytes, the Co'iiju//(dac, 

 Phacophyceae, and Ehodophyccae only species endophytic in other 

 algae or in animals. The Chlorophyceas, 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 Volvocaceac, Tetra- 

 sporaceac, Chlorosphaeraceae, Fleurococcaceae, Frotococcaceae {Endos- 

 pliacraccac, Characieae, Sciadiaceae), and Hydrodidyaccac. 



2. Confervoideae including the families Ulvaceac, Ulothrichaccac, 

 Chaetophoraceac Mycoidcaccae, Cylindrocapsaccae, Oedogoniaceae, 

 Coleocliadaceae, Cladophoraceae, Gomontiaccae, and Spliaeropleaceac. 



3. Siphoneae including the families Botrydiaccae, Phyllo- 

 siphonaccae, Derhesiaceae, Vaucheriaceae, Bryopsidaceae, Caider- 

 paceac, Codiaccac, Valoniaccac and Dasydadaceae. 



Chlorosphaeraceae. 



Chlorosphaera endophyta Klebs. This is found between 

 the living epidermal cells of Lemiia rninor, and produces there 

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

 swellings. According to Frank, this is related to Bndodonivm 

 poljiriuirplL urn Frank. 



Entophysa charae IMob. This lives under the cuticle of 

 the e}jidermal cell-wall of Cliara Horiumanni 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. 



Chhirochyfrinm inclwdes eight European species all endophytic 

 in living i)liints. 



' The aiiangeiiic'ut used by "Wille in Enfilcr-Prantl. uatur. Pflanzen-famUkii. 



