Somerset 293 for 4 (Abell 105*, Lammonby 87) trail Nottinghamshire 360 (Stone 83, Haynes 55, Clarke 51, Aldridge 5-94) by 67 runs

It is a first hundred for the 30-year-old since he relinquished the Somerset captaincy after struggling for form last year, although he missed the start of the current campaign through injury and this is only his second match in the Championship.

At the start of the day, Nottinghamshire had extended their first innings by nine overs from 326 for 8 overnight, picking up a third batting point before Somerset's bowlers could winkle out the last two wickets, seamers Migael Pretorious (4 for 96) and Kasey Aldridge (5 for 95) finishing the job for figures that reflected their fine contributions on day one.

Nottinghamshire fast bowler Olly Stone, the principal architect of a recovery from 190 for 7 on day one, fell just before the 350 was reached, edging Pretorius to second slip for an 83 that was warmly acknowledged by the home crowd, who saw him make 90 against Lancashire last month after beginning the season with a first-class average of 15.38.

Aldridge completed his five-for when Dane Paterson, earlier dropped by wicketkeeper Rew, was caught on the extra cover boundary, with Dillon Pennington, having enjoyed some good fortune in picking up six boundaries, unbeaten on 29.

As Somerset began their reply, Pennington picked up an early scalp with the ball thanks to a fine catch at third slip by Will Young as Andy Umeed departed in the sixth over.

Tom Kohler-Cadmore, dropped by Calvin Harrison at second slip before he was of the mark, made 38 in his first Championship action of the season before falling soon after lunch to a superb piece of work on the leg side by Tom Moores, who has the 'keeper's gloves back for the first time this season in preference to Joe Clarke, as Stone gained his 15th wicket of the Championship campaign.

Thereafter, it was a frustrating afternoon for Nottinghamshire and a profitable one for Somerset, who added 105 runs in the session as Lammonby and Abell patiently built a half-century apiece, in the former's case for the sixth time this season.

Lammonby's came from 104 balls with six fours, among them a couple of glorious off-drives. Abell completed his from 101 balls soon afterwards, clipping Harrison crisply to the leg side for his seventh boundary.

There had been little encouragement for the bowlers in that time. Nottinghamshire skipper Haseeb Hameed had a number of discussions with the umpires about the condition of the ball, which had already been changed once in the innings. Eventually it was replaced again, although with no discernible change in its behaviour.

The footmarks left by Pennington and Stone gave Harrison something to aim at, and the leg-spinner would have been cheered by a delivery soon after tea that turned sharply enough to beat the left-handed Lammonby's inside edge, even if the end result was four byes.

In the event, it was at the other end, where the four Nottinghamshire seamers had been patiently rotated by Hameed, that the breakthrough came as Lammonby, perhaps letting his concentration drift for a moment, played across a ball from Paterson that held its line and was leg before.

It broke the partnership after 48 overs, after which the wait for the next wicket was considerably shorter - just seven deliveries - as new batter Tom Banton prodded at one from Harrison to be caught behind.

The second new ball raised Nottinghamshire's hopes of further gains. In the event, none came in the five overs before the close as Abell turned the injection of some pace to his advantage, despatching a couple of leg-side deliveries to the boundary to complete a 202-ball hundred containing 12 fours.