I \ I' I . A N A T I N OP T II K P L A T K S. 261 



Fig. - " -V portion of a female plant, .showing the beginning of the development of the fcmulo 

 gi-rin, i. < the formation of u very large coll. 



Fig. '2 l>- A further stage of the process, showing the cell divided into au upper and lower por- 

 tion, with the outline of the attached male plant. 



Fig 2 o. A fertile filament containing u matured spore. All of these figures are magnified ICO 

 diameters. 



Fig. -2 d. A couple of cells, one of which lias divided into four daughter-cells, each of which 

 contains u nearly perfected andm-pore, magnified -ir.i) diameters. 



Figs. 2 6 and 2 <j. Different views of dwarf male plants discharging spermatozoids, the first figure 

 offering a profile view of the cap, the second a view from behind, magnified 400 diameters. 



Fig. -2 e. A three-celled dwarf male plant, magnified 4CO diameters. 



Fig. 3. Matured spore of (Edogonium echinatum, Wood, uncolored and magnified 750 diameters. 



Fig. 4. Spores in sporangia of a Florida (Edogonium of undetermined species. 



Fig. 5. Jinlbockxte ignola, Wood. 



Fig. 5 a. Branches of a frond, showing different stages in the early development of the female 

 germs. 



Fig. 5 6. Sporangium containing a nearly matured spore. All magnified 400 diameters. 



Fig. 6 a. Part of a frond of Dulbochede dumosa, Wood, with female jrerms and dwarf male plants 

 in iliflVrcnt stages of development, magnified 2GO diameters. The fine markings on the spores have 

 not been reproduced in the chronio-lithograph from my drawing. 



Fig. 6 6. Male plant discharging spermatozoid, magnified 750 diameters. 



Fig 7 i. Part of a sterile filament of a Conferva of unknown species. 



Fig. 7 6. The same discharging zoosporcs. 



Fig. 7 c. A cluster of germinating zoospores. 



Fig. 7. A young plant. All these figures are magnified 500 diameters. 



PLATE XIX. 



Fig. 1. Sligeoclonium, showing chtctophoroidal stage. 



2. Portion of a fertile filament of Chantransia expama, Wood, magnified 125 diameters. 

 Fig. 26. A fragment of a fertile branch, magnified 2CO diameters. 



Fig. 3. A portion of a fertile filament of Chanlransia macrospora, Wood, magnified 460 

 diameters. 



Fig. 4 a. Outline of some fertile cells of Spiroyyra quinina, Ag. 

 Fig. 4 b. Filaments in an advanced stage of conjugation. 

 Figs. 4 c and 4 e. Fragments of sterile filaments. 



PLATE XX. 



Fig. 1. Stigeoclonium, found near Philadelphia. 



Fig. 2. Arthrodesmus quadridens, Wood, as viewed from the end, and magnified 259 diameters, 

 also a front view of similar amplification. 



Figs. 3 and 3 a. Different forms of fructification of Vaucheria polymorjjha, Wood, showing the 

 emptied antbcridia and fertile sporangium. 

 Fig. 3 ft. An immature antheridium. 

 Fig. 3 c. Spore of same species, 



Fig. 4. Section through fertile node of Lcmanca lortilosa (Roth). 



