178 



Fig. 97. 



Petrocelis Htnnediji, from the 

 North Sea (Klilmoller), August. 

 Vertical filaments with anthe- 

 ridia 390:1. 



Fig. 9(5. 

 Peirocelisllenin'ihji,\\\i\\ 

 crust Irom Lillehelt, 

 March. Vertical fila- 

 ments witli truncate 

 end-cell Sporangia sub- 

 terminal or terminal. 

 390,: 1. ^ 



or three on the same stalk (fig. 97). Some- 

 times they appear to be produced dheclly 

 from a cell of the vertical filament. 



The carpogonial branches are si- 

 tuated laterally on the vertical filaments. 

 They are somewhat variable in shape 

 and number of cells. Usually they are 

 two-celled, and the undermost cell then 

 frequently projects considerably down- 

 wards beyond the insertion point (fig. 99 A). 

 More rarely the carpogonial filament is 3-(or 4-)celled. A carpogo- 

 nium situated directly on the vertical filament was also met with, 

 but the cell from which it was given off had in this case the 

 character of the cells of carpogonial branches (fig. 98 A), its con- 

 tents being more homogenous and staining more intensely by 



hcematoxyline than the 

 ordinary cells. This 

 may also sometimes be 

 the case with the cell 

 bearing 2-celled carpo- 

 gonial branches (fig. 

 98 B). The cell bearing 

 a carpogonial branch is 

 frequently swollen, re- 

 sembling the auxiliary 

 cells. 



The auxiliary cells 

 arise from single cells 

 in the vertical filaments, 

 which become some- 

 what swollen and more 

 susceptible to colouring 

 matter. They appear 

 to arise in some cases 

 from cells having pro- 

 duced a hair (fig, 98 

 G, H). The develop- 

 ment of the cystocarps 

 has not been follow- 

 ed; I have only obser- 

 ved a few stages suc- 

 ceeding the presumed 



Fig. 98. 



Pelrocelis Heiinediji, from Bornholm, July. A, carpogonium situated directly on 

 the vertical filament. B D, two-celled carpogonial branches; in li and D the 

 supporting cell has the same character as tliose of the carpogonial branch. E, 

 carpogonial branch with short sporogenous filaments given otf from the carjio- 

 gonium and the subjacent cell. F, carpogonial branch producing (sporogenous ?) 

 filaments. G, vertical tilament with two larger cells, one of whicli bears a hyaline 

 hair, ii, vertical filament with a jiresumed auxiliary cell witli scar after a decayed 

 hair, / and K. auxiliary cells in contact with sporogenous filaments. L, probably 

 young gonimoblast. A—E and L, 630 : 1 F—K 390 : 1. 



