Here's what Condit said about it:
syns. White Ischia, Singleton, Brocket Hall
"As explained above; the exact identity of this variety is uncertain, the name White Ischia having been applied after its introduction into England, where it proved to be especially good for pot culture and for forcing. Barron (1868c) thus gave his opinion ofit: “The little white Ischia is very fickle in respect to quality; the fruits of today are excellent, of three days hence watery and tasteless; the tree bears fruit as profusely as a gooseberry bush.” Accounts of the variety in the southern United States are somewhat uncertain, because of the possible confusion of the White and Green Ischia. Starnes found Ischia White “decidedly the first choice” for Georgia, where the fruit shriveled and dried naturally on the tree in good seasons. In 1948, a tree of this variety was found growing at Grosse Coate, near Easton, Maryland.
According to Eisen, Ischia was introduced into California in 1853 by W. B. West, from a nursery in Boston, and in 1883 the California Nursery Company, Niles, received it from England. It was also brought in as P.I. No. 18,886 of the Chiswick collection. Large trees are commonly found in the Sierra Nevada foothills, and before 1922 there was a small orchard of at least eighty-four trees near McFarland in Kern County. One of the largest trees of this variety is on the place of Mrs. Nettie Sullivan, Grabner P.O., Fresno County, near the upper end of Millerton Lake; it is reported to have been planted by Wilburn Winchell in 1851. In Merced County an Ischia tree is growing in a dooryard at Plainsburg.
Although trees were grown at the early California Experiment Stations, the variety failed to receive favorable attention on account of the small size of the fruit. In good weather the figs dry partly on the tree and drop with little spoilage; they are also good for homemade preserves and pickles.
The tree has a dense habit of growth, with numerous small, short twigs; terminal buds are olive green in color. Leaves small, glossy above, mostly 3-lobed; upper sinuses shallow and narrow; base truncate, sometimes decurrent; margins crenate (plate 13). Description of figs is from specimens grown at Riverside.
Breba crop small or none; fruits below medium, spherical, with very short neck; stalk short and thick; eye rather large, open; color of skin green, tinged with violet; pulp light strawberry; quality poor.
Figs of second crop borne profusely; size small, averaging 18 grams in weight, up to 1-1/2 inches in diameter by 1-1/4 inches from base to apex; shape oblate to spherical, with or without short neck; stalk short and thick, or up to 1/2 inch long, sometimes swollen toward the apex; ribs narrow, prominent; eye medium, open, scales pink; surface dull, with faint bloom; white flecks scattered and inconspicuous, as shown by Condit (1941a, fig. 9, H); skin checking crisscross, discolored or blemished by circular brown spots at complete maturity; color green, flushed with violet; meat white, thin; pulp very light strawberry; flavor sweet; quality fair. (Plates 9; 15, D.)" .
Hope it helps some.