A small Brazilian cattleya with olive-green petals heavily barred in maroon and a lip of magenta so saturated it looks lit from behind. It grows on one particular kind of tree in one dry coastal region of Bahia and nowhere else, which made it precisely the sort of plant the collecting mania of the 1840s was most dangerous to. The Register printed it in the year it flowered in England for the first time. Rarity is a description of a habitat, not a virtue of a plant.

Maker: for John Lindley, Edwards’s Botanical Register
Date: 1840
Medium of the original: Plate
Original held by: Wikimedia Commons
Credit: Wikimedia Commons
Rights: Public domain, verified
Catalogue number: PA-01040

As chosen: 24 x 16 in, art print, classic frame
Picture	24 x 16 in
Outside size	25.6 x 17.6 in
Depth	0.9 in (22 mm)
Weight	[[REAL PROOF NEEDED: shipped weight per size and frame]]
Hanging	[[REAL PROOF NEEDED: hanging hardware Prodigi fits to this frame]]
Material	Enhanced matte art paper, 200 gsm; acrylic glazing
Made in	Charlotte, North Carolina, by Prodigi

Before a size goes on sale, the file is measured against it: pixels per inch at that size, how much of the picture a crop would lose, tone and sharpness. A size that fails is not offered, so there is nothing to choose wrong.

How the print check works

Sizes offered
Size	dpi	Grade	How it fits
12 x 8 in	352	Excellent	Trimmed 3.6%
18 x 12 in	235	Excellent	Trimmed 3.6%
24 x 16 in	176	Good	Trimmed 3.6%

Sizes withheld
Size	Why
10 x 8 in	Wrong shape: a 20% crop
14 x 11 in	Wrong shape: a 18% crop
16 x 12 in	Wrong shape: a 14% crop
20 x 16 in	Wrong shape: a 20% crop
24 x 18 in	Wrong shape: a 14% crop
30 x 20 in	141 dpi; a historical scan is never enlarged
30 x 24 in	Wrong shape: a 20% crop
36 x 24 in	117 dpi; a historical scan is never enlarged
40 x 30 in	Wrong shape: a 14% crop
48 x 36 in	Wrong shape: a 14% crop
60 x 40 in	70 dpi; a historical scan is never enlarged