Image Interpretation

 

What are the features labeled A-D? Try and identify the plant stems. How would you distinguish between fungal hyphae, green algal (chlorophyte) and cyanobacterial filaments? What problems are there in identifying these in the Rhynie chert? The scale bar = 2mm.

A:   
B:   
C:   
D:   
Plant:  
Identification and problems: