|LV= County Championship Division Two, Bristol|
|Lancashire 275 & 253: Brown 56, Clark 48, Prince 43; Miles 5-60|
|Gloucestershire 277 & 160: Dent 54; Jarvis 5-39, Faulkner 3-18|
|Lancashire won by 91 runs|
|Gloucestershire 5 pts, Lancashire 21 pts|
Lancashire beat Gloucestershire by 91 runs at Bristol to extend their lead at the top of Championship Division Two.
Paceman Kyle Jarvis took 5-39, his third five-wicket haul of the summer, to become the country's leading wicket-taker in first-class cricket.
Having resumed on 26-1, Chris Dent's 54 moved Gloucestershire onto 104-2 at lunch, needing 148 more runs to win.
But Jarvis and Australia seamer James Faulkner (3-18) combined to bowl the hosts out for 160.
Gloucestershire, who have now won two and lost three of their opening seven County Championship matches, lost their last eight wickets for only 47 runs.
The defeat was also compounded by news after the game that wicketkeeper Gareth Roderick's thumb injury was a fracture, keeping him out until the Cheltenham Festival in mid-July.
Victory meant Lancashire, inspired by the bowling of 26-year-old Zimbabwean Jarvis, who had match figures of 9-106, were able to extend their advantage over Surrey at the top of the table to 31 points.
Under director of cricket Ashley Giles, the Red Rose are looking to secure an instant return to Division One following relegation last season.
Gloucestershire skipper Geraint Jones:
"We are hurting in the dressing room because we had got ourselves into a position where we felt we had Lancashire.
"That makes the disappointment of losing all the greater. We describe ourselves as a young side, with some experience, and that was evident today.
"The worst of it was that we lost so many wickets bowled or lbw when we knew Lancashire would bowl at the stumps on that sort of pitch.
"Every game is a learning experience and we need to get over this setback quickly."
Lancashire pace bowler Kyle Jarvis:
"To have 47 wickets at this stage of the season is very pleasing for me.
"I am at my best when I can run the ball back at batsmen and that is what started to happen this afternoon
"Gloucestershire played some excellent cricket and made it a very tough game for us. But we never felt out it and knew if we kept the ball on the right line and length things would start to happen.
"It's another huge win which has put us in a very strong position in the table. But nothing has been achieved yet and there is a lot of hard work still ahead."