W. PALM BEACH, Fla. – The leaves may be showing off their rich autumn hues in New England and other parts of the country, but in sunny South Florida, fall means palm trees, mild temperatures and the much-anticipated season opener at Palm Beach Modern Auctions (PBMA). The company’s fully curated Sept. 24 Modern Art, Design & Decorative Arts sale is brimming with exceptional paintings and furniture by the most desired 20th-century and contemporary artists, with special additions that include a connoisseur’s collection of fountain pens and a luxurious 1988 Rolls-Royce Silver Spirit Mulsanne. Absentee and Internet live bidding will be available through LiveAuctioneers.com.