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Fig. 4. Acrochaetium robustum Boergesen. A. Habit of plant with 
monosporangia. Note single basal cell. Scale B (divisions 50 
microns). B. Portion of plant with part of multicellular base. Scale 
C (divisions 10 microns). Acrochaetium serratum Boergesen: C. 
Portions of plants showing monosporangia. Scale C (divisions 10 
microns). 
