一枝蕨叶的极简标本海报

Text-free minimalist botanical poster with one pressed fern frond, a thin graphite rule and generous warm paper margin; precise specimen shadow and editorial hierarchy without type.

无文字极简植物海报：一枝压平的蕨叶、一条细石墨线与大面积暖纸留白；标本投影准确，版式层级清楚。