"Spore posses true walls". Here what true walls mean?

GUD ANSWER.

true walls in these context means a hard coat present outside the spores and are responsible for providing protection to the spores from the surroundings and also heping them to survive even in adverse condition.

So guys! you know that during unfavourable conditions, slime moulds differentiate and become fruiting body which have spores at their tips. Now spores are at tips and should possess walls that protect them. Therefore true wall is that cell wall which completely protects the spores over the fruiting bodies in slime moulds.