After being sentenced to death by stoning for adultery, Sakineh Mohammadi Ashtiani now faces being whipped for indecency, her son said.
Following the Times newspaper publishing a picture purportedly of her without a headscarf on 28 August, Iranian authorities sentenced Ashtiani to 99 lashes.
Later the Times published a correction, saying the photograph was of a different Iranian woman.
Ashtiani’s stoning sentence was temporarily halted by Iranian officials in July because of an international outcry.
But there are fears the death sentence could still be carried out by hanging.
Ashtiani’s son has given several interviews saying he was told of the new sentence of 99 lashes by people who have recently been released from the prison in Tabriz where his mother is being held.
The Times said it had obtained the picture from Ashtiani from one of her lawyers.
The lawyer, Mohammad Mostafei, who has fled Iran, said he received the picture from her son, Sajad Ghaderzadeh, a claim Ghaderzadeh denies.
Ghaderzadeh said the new sentence was “an excuse to increase [the authorities’] harassment of our mother”.
In an open letter, he said his mother had been sentenced to receive 99 lashes “on false charges of spreading corruption and indecency by disseminating this picture of a woman presumed to be her without hijab”.
He said he did not believe the sentence had been carried out. However he added that her family and lawyer had not been allowed to visit her for two weeks and that she had not been allowed to use a telephone.
Ghaderzadeh also said the family was appealing against the sentence.
Ashtiani already received 99 lashes in May 2006, when a criminal court in East Azerbaijan province found her guilty of having had an “illicit relationship” with two men following the death of her husband.
Yet this September, during the trial of a man accused of murdering her husband, another court reopened an adultery case based on events that allegedly took place before her husband died.
Even though she retracted a confession saying she had been forced to make it under duress, Ashtiani was convicted of “adultery while being married” and sentenced to death by stoning.
In August, Iranian TV aired what it said was a confession from Ashtiani of her involvement in her husband’s 2005 murder.