Simple past tense and past participle of interspace.(verb)
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Use "interspaced" in a sentence
"I think you're right about splitting it into two baby quilts - it probably wouldn't be quite so intensive say if you'd interspaced with a plain navy fabric - looks good though"
"This piece of film was so mesmerizing in its bits of floral beauty, interspaced with magnificent works of art once hidden in the earth and brought back to life by men & women called archaeologist yet i call them magicians for they make these wonders of art to reappear for all to see what ancient people were capable of achieving with simple tools and a hugh amount of patience."
"The 14,800-square-km district consists of high mountains interspaced by isolated valleys where small communities have lived for centuries free from outside interference."