Plants of the Gila Wilderness
Presented in Association with the
Western New Mexico University Department
of Natural Sciences
Lasallia papulosa (Ach.) Llano
Common Toadskin
Lasallia papulosa is attached to boulders at a single point (umbilicate). When wet, the thallus is dark brown. When dry,
the dense pruina (covering of whitish granules) can give it a gray or whitish color. The upper surface is notable for
raised areas called "pustules", while there are holes or depressions on the brown colored undersurface. Small, black (lecideine) apothecia dot the upper surface. We found L. papulosa on a rocky outcrop alongside an upper elevation moist canyon.
Please click on an image for a larger file.
Lasallia papulosa, photo Russ Kleinman, Jason Roback & Karen Blisard, Gila NF, S. Fork of Negrito Creek near
Gwynn Campground, October 17, 2020
Lasallia papulosa, photomicrograph of upper surface of thallus, photo Russ Kleinman, Jason Roback & Karen Blisard, Gila NF, S. Fork of Negrito Creek near Gwynn Campground, October 17, 2020
Lasallia papulosa, photomicrograph of upper surface of thallus near holdfast, photo Russ Kleinman, Jason Roback & Karen Blisard, Gila NF, S. Fork of Negrito Creek near Gwynn Campground, October 17, 2020
Lasallia papulosa, photomicrograph of upper surface of thallus near holdfast, photo Russ Kleinman, Jason Roback & Karen Blisard, Gila NF, S. Fork of Negrito Creek near Gwynn Campground, October 17, 2020
Lasallia papulosa, photomicrograph of small lecideine apothecia on upper surface of thallus, photo Russ Kleinman, Jason Roback & Karen Blisard, Gila NF, S. Fork of Negrito Creek near Gwynn Campground, October 17, 2020
Lasallia papulosa, photomicrograph of bottom surface of thallus, photo Russ Kleinman, Jason Roback & Karen Blisard, Gila NF, S. Fork of Negrito Creek near Gwynn Campground, October 17, 2020
Lasallia papulosa, photomicrograph of bottom surface of thallus, photo Russ Kleinman, Jason Roback & Karen Blisard, Gila NF, S. Fork of Negrito Creek near Gwynn Campground, October 17, 2020
Lasallia papulosa, photomicrograph of photobiont (Pseudotrebouxia), photo Russ Kleinman, Jason Roback & Karen Blisard, Gila NF, S. Fork of Negrito Creek near Gwynn Campground, October 17, 2020
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