| ARMILLARIA | Fungus that's a jolly bad strain |
| SNOWSTORM | Immediately getting on board before jolly bad weather |
| ECOLI | Ran away from Caroline producing a bad strain (1,4) |
| VIRUS | Bad strain? |
| ASPIRIN | Bad strain? I might take this! (7) |
| LINES | Jolly bad luck, as the English would say, if they're not easy to memorise! (4,5) |
| HARD | Jolly bad luck, as the English would say, if they're not easy to memorise! (4,5) |
| PECAN | Name a fungus that's set back nut-tree |
| DIEBACK | Condition, possibly triggered by a fungus, that's attacking and killing eucalypts across Australia |
| EARTHSTAR | Kind of fungus that's rare, unusually so (9) |
| MOREL | Fungus that's better left (5) |
| CEP | Fungus that's fine for feasting (3) |
| MUSHROOM | So, we have another fungus that's sure to spread? (8) |
| ARMADA | A jolly girl using a lot of craft |
| ANIMALFARM | A game man had with a jolly book |
| ARMADILLO | A drug initially swallowed by a jolly sick old animal |
| FROSTY | *"A jolly happy soul," in a holiday song |
| MARINER | A sailor will put a jolly right... (7) |
| THERM | A jolly lot put together a little house-warming? (5) |
| ALL | At a birthday you might sing, "For he's a jolly good fellow, and so say ... of us" |
