Subject ASC0000br7
The Intellectual observer.
v.5 (1864), (1864)
Harvard University, MCZ, Ernst Mayr Library
BHL Page 39488486
Keywords
ferns plants seeds botany fern spore foramen germination development cell vesicle germ radia extine spores fern: fern spores: plants: germination fern spores exogenous seeds diagrams microscopic view spore germination back young