| Name | Lactarius indigo |
| Group | Agaric |
| Description | Bright blue with concentric rings on pileus, fading to greenish blue with age. Copius blue latex when cut, short stipe relative to pileus width. |
| Distribution | Beneath Quercus oleoides forest on Rincón de la vieja, throughout Santa Rosa. Very common at Finca Jenny. |
| Pileus | |
| Color | Bright blue |
| Shape | Convex, shallowly to deeply depressed |
| Diameter | 3.5-11 cm |
| Surface | Smooth |
| Margin texture | Entire |
| Margin Shape | Involute to arched |
| Context color | Blue |
| change? | |
| Hymenophore | |
| Color | Blue |
| change? | greenish or brownish with age |
| Gill attach | Subdecurrent |
| Gill spacing | Close |
| Lamellulae? | Many |
| Stipe | |
| Color | Bright blue |
| Position | Central to Excentric |
| Form | Variable |
| Length | 1.8-7 cm |
| Diameter | 8-19 mm |
| Surface | Smooth |
| Other | |
| Growth habit | Scattered to gregarious |
| Volva | No |
| Annulus | No |
| Spore Print | Pale yellow |
| Notes | Copious blue latex when cut, stipe often hollow |
