2647-19. Liverwort Fringed Heartwort (Ricciocarpos natans) and Giant salvinia (Salvinia molesta) on mud flats of Lake Conroe at low water level on Stubblefield section of Lone Star hiking trail north from Trailhead No. 6 in Sam Houston National Forest. Texas, February 16, 2020Similar picturesSmall thumbnails | Use large thumbnails | View as slideshow |