Much was made of a recent trio of high-profile “Fare Thee Well” shows during which the surviving core members of the Grateful Dead joined Trey Anastasio of Phish and singer-pianist Bruce Hornsby to celebrate the 50th anniversary of the Grateful Dead. But watching Phish perform a show Saturday night for a near-capacity Forum crowd that clocked in at nearly three hours was to confirm that the late Jerry Garcia’s wide-ranging spirit is still thriving in the capable genre-blending hands of the Dead’s most noteworthy musical descendants.

Formed in 1983, the Burlington, Vermont-spawned Phish has long demonstrated its staying power. The enduring lineup of the aforementioned Anastasio (guitars, lead vocals), Mike Gordon (bass, lead/backing vocals), Jon Fishman (drums, backing vocals) and Page McConnell (keyboards, backing vocals) offered up a winning brew of rock, funk, jazz-rock, psychedelia, Celtic, jam rock and folk rock in what often felt like a Dead show (including the ancillary add-ons such as tie dye and ’60s-style attire).

Phish-heads were treated to a long night of original material that touched on all periods of the band’s two-part run (the group was on hiatus from August 2004 to March 2009) while the hazy skies above the packed floor were filled with floating beach balls and a parade of thrown glow sticks. A dazzling range of multicolored lights emanated from above and behind the stage, further adding to the vibe.

Phish was on fire most of the night, notably with the 10-minute “Down With Disease” that started with heavy bass but soon morphed into an extended sortie allowing for intricate interplay among all four instruments and some sweet three-part vocal harmonies. At one point during his virtuoso-worthy guitar solo, Anastasio began jumping up and down in excitement as the crowd cheered.

After the relatively hard-rocking “Down With Disease,” Phish shifted sonic gears and performed the lovely “Waiting All Night,” a jazz-tinged song that was nuanced throughout.

The first half of the show ended with a dazzling one-two punch of the jam rock-powered title track off the band’s latest studio disc (2014’s wonderful “Fuego”) and subsequent 2002 gem “Walls of the Cave.”

The second half of the concert was even more intense, with Phish performing forceful versions of a new song, “No Men in No Man’s Land” (complete with an expansive psychedelic-minded guitar solo), as well as classics such as the hard-rocking “Carini” (bolstered by a dueling guitar and keyboard solo), the funky “Tweezer” and “Slave to the Traffic Light” (a song that somehow blended myriad styles during its prolonged run).

The band’s 20-minute encore included the crowd favorite “You Enjoy Yourself,” topped off with the winning live attraction known as “The Rotation Jam,” during which each member briefly plays another member’s instrument. And, yes, Gordon and Anastasio used the live standout to astound with their ability to complete intricate choreography while jumping on their mini-trampolines.