SPECIES OF AhGM. 55 



62. RHAPHIDIUM. 



a. Cells straight or nearly so, length 15-20 times the diameter, 



acinilare, k)"] 

 a. " " " " " " 20-30 or more times the diameter, 



contorttim, 198 



a. Cells decidedly curved; often crescentic or sigmoid {I)). 



b. Cells sigmoid, single or 2-4 connected .... sigmoideum, 198 



b. Cells more or less crescentic (<:). 



c. Cells connected back to back, crescentic, sometimes single, 



convolutum, 198 

 c. Cells not connected, long, slender, .... falcatum, 198 



c. " " " short, thick, diameter 5-7/* . Braunii, 198 



63. DltlORPHOCOCCUS. 



One species . . . . cordatus, 199 



64. MISCHOCOCCUS. 



One species . . . . . . ., . confervicola, 200 



65. EREMOSPHjERA. 



One species . viridis, 200 



66. UROCOCCUS. 



a. Stem densely ringed, often divided .... Hookerianus, 201 

 a. Stem short, remotely annulated . insignis, 201 



67. APIOCYSTIS. 



One species . . ... Brauniana, 202 



68. CHYTRIDIUM. 



a. On the oogonia of various ffii^^^^^/a; cells somewhat urn-shaped, 

 with a lid acuminatum, 202 



a. On various filamentous Algae (i^). 



b. With a low lid; pale yellow . . . . minus, 203 

 b. Without a lid; cells spherical ...... globosum, 203 



69. OLPIDIUM. 



§ On the exterior of the host; cells globose; mouth cylindrical, 

 nearly as long as the cell ampullaceum, 203 



§ In the interior of the host; perforating neck tubular, middle 

 globosely dilated . . intestinum, 203 



§ In the interior; perforating neck straight, not inflated, 



entophytum, 204 



