This was the first time I had seen a Rattlesnake Fern - seen on 30th July at the Sheep River Natural Area, when we botanized the Threepoint Creek Natural Area. This photo shows an enlarged view of the small fruiting body. A stalk forms at the base of the frond on the fern stem. This stalk grows above the frond and bears bright yellow spore cases in stalked clusters that resemble grapes.