At seven last Saturday evening, Helen Palmer Lane and Christopher Stump Middendorf were married in the Jacksonville, Fla. home of her parents, Mr. and Mrs. Edward W. Lane Jr. Mr. Middendorf is the son of Mr. and Mrs. W. Kennedy B. Middendorf of Syosset, N.Y. A reception was held at the Timuquana Country Club.

Mrs. Middendorf looked beautiful in an heirloom veil worn by her mother and five other brides in her family. The four and a half yards of Point de Venise lace was made in Belgium over 150 years ago for a grand duchess of Russia and was purchased in 1922 by the bride's great - great - uncle, James Wadsworth Spratt. The bride's wedding dress was delicately appliqued with imported Alencon lace and tiny seed pearls on sheer English net over bridal satin and fell gracefully into a chapel length train bordered with matching lace and pearls.

Anna Taliaferro Lane, the bride's sister, was maid of honor accompanied by her cousins, Carita Doggett Corse and Margaret Murchison Corse, both of Jacksonville and Atlanta; Mrs. Peter Beuttell, Stoney Bottom, W.Va.; Mrs. Thomas Edgar, Jacksonville; Mary Middendorf, Syosset, the groom's sister; Mrs. Latham Murray, Charlottesville, Va.; Mrs. Vasil Pappas, Pittsburgh, Pa.; Mrs. Donald Porter, Greenwich, Conn.; and Mrs. Garrett Rasmussen, Washington, D.C., the groom's sister, as the bridesmaids.

Mr. Middendorf's brother, Alexander Middendorf of Syosset, was best man assisted by Clement Wood, Chicago; Jem Hom, Washington, D.C.; Charles Murchison Lane and Edward W. Lane III of Jacksonville, brothers of the bride; Steven Ohler, New York; Garrett Rasmussen, the groom's brother-in-law; Robin Rose, Ocala and this city; Ralph Schlosstein, Washington, D.C.; and Joshua Strychalski, New York.

Among the many out-of-town guests were the groom's uncle and aunt, the Honorable and Mrs. William Middendorf of this city - he is the former ambassador to Holland and was also Secretary of the Navy; and Mrs. Dena Clark also of Washington, D.C., the television personality.

The bride's grandparents are Mr. and Mrs. Charles Holton Murchison of Jacksonville. Mr. Murchison is a practicing lawyer and partner of the law firm of Ulmer, Murchison. Her paternal grandparents are the late Mr. and Mrs. Edward Wood Lane of Jacksonville, where Mr. Lane was the founder and first chairman of the board of the Atlantic National Bank. Mr. Middendorf's grandparents are the late Mr. and Mrs. Harrison Reynolds of Boston, Mass., the late Mrs. Boone Middendorf, and the late Harry S. Middendorf of Reisterstown, Md.

Mrs. Middendorf, whose father is chairman of the board of the Atlanctic Bancorporation, was educated at the Bartram School; made her debut at the Debutante Coterie in 1971 and took a BA in philosophy from Sweet Briar College in 1973 - spending her junior year at Washington & Lee University in the exchange program. In 1975 she received a master's in art history from Tulane University and has also studied at the University of Caens in France.

Mr. Middendorf's father is president of the United Mutual Savings Bank of New York. He prepared at the MIddlesex School, and in 1974 graduated cum laude from Harvard University where he was a member of the Fly Club, was captain of the Harvard Sailing Team, and was elected to the Collegiate All American Sailing Team in 1974. In that year he founded the Middendorf Gallery in Washington, D.C., and is now the co-owner, with his bride, of the Middendorf/Lane Gallery, specialist in twentieth century American art.

The Middendorfs will spend their honeymoon in Paris, France and take up residence in this city.