fern sorus, a cluster of sporangia. pteris, 100xat 35mm. shows the sporangium, spores, and annulus. - 環狀組織 個照片及圖片檔
fern sorus, a cluster of sporangia. pteris, 50x at 35mm. also shows spores and annulus. - 環狀組織 個照片及圖片檔