The phrase "acorn cup" is correct and usable in written English.
It can be used to refer to the cup-like structure that holds an acorn, often in discussions about nature, botany, or wildlife.
Example: "While walking through the forest, I noticed many acorn cups scattered on the ground beneath the oak trees."
Alternatives: "oak nut cup" or "acorn shell".
It looks like some magician that is about to yank a trick out of its acorn cup.
"An acorn cup becomes a bowl, toothpaste caps funnels for ocean liners, twigs knees for an ostrich".
It stares long and long into the rimmed, bucket-like acorn cup that it is gingerly carrying in its left hand, as if summoning the future.
Bullied at school, Judith finds solace in the model world she creates in her bedroom: "An acorn cup becomes a bowl, toothpaste caps funnels for ocean liners, twigs knees for an ostrich".
Lookalikes include the acorn cup (Hymenoscyphus fructigenus) that grows on fallen acorns and hickory nuts.
Aspergillus oryzae was co-cultured with Trichoderma reesei using acorn cups extract containing up to 62% ellagitannins as substrate to produce ellagic acid with relatively high levels of ellagitannin acyl hydrolase, cellulase and xylanase.
Oaks can be separated into three groups, sometimes considered subgenera: white oaks (Leucobalanus) and red or black oaks (Erythrobalanus) have the scales of the acorn cups spirally arranged; in the third group (Cyclobalanus) the scales are fused into concentric rings.
The park has "an imaginative collection of trees; not just the ubiquitous planes and sycamores, and not the easy-care lollipops of cherries either, but hornbeams, service trees, acacias and Turkey oaks with bristly acorn cups like little sea anemones.
Some of the carpets, dyed with natural ingredients such as walnut skins, pomegranate and acorn cups, took 10 years and five people to make, store owner Alex Helmi says.
For hundreds of years, the rugs have been handmade by small groups of weavers and dyed with natural ingredients such as walnut skins, pomegranate and acorn cups.
He brought us a little dish of toasted acorns, cups of honey-sweetened sumac tea, and goblets of a musky black broth made from decomposed inky-cap mushrooms.
