The term perisperm is a term used for the remains of the nucellus in dicotyledonous seeds (Fahn 1982) and could be used for the remains of the nucellus covering the micropylar end of the female gametophyte, but not for the pleurotesta.
In the micropylar end of the seed, there are two separate membranous structures; the one closely adhering to the sclerotesta is the unvascularised part of the pleurotesta, derived from the inner layers of the integument whilst the other one represents the remains of the nucellus (perisperm), firmly attached to the female gametophyte and covering the archegonium chamber.
At the micropylar end of the seed, the megagametophyte (sometimes erroneously called endosperm) is covered by the brown, papery left over of the nucellus (perisperm) and forms a cap over the archegonial chamber and radicle (Fig.
Proximal nucellar structures include the hypostase, postament, podium, and perisperm. Tilton (1980b) reviewed earlier literature and recommended the consistent use of individual terms for specific modifications, such as pseudochalaza, nucellar plasmodium, hypostase, postament, chalazal proliferating tissue, and Zuleitungsbahn (conducting passage) or Starkestrasse (starch route).
24) there is a massive proximal chalazal region (see perisperm, below).
However, judging from the illustrations, this tissue is not a typical thick-walled hypostase (although it is adjacent to the antipodals), but an enlarged thin-walled region of the nucellus, possibly with a storage function, as in, e.g., Dasypogonaceae and Rapateaceae (see perisperm below).
Only in late developmental stages does the endosperm replace the surrounding
perisperm and/or the integumentary tissue (e.g., Apocynaceae: Periasamy, 1963).
Examples include the pluralised nouns FORESHORES, HANDSTANDS, HARUMSCARUMS, HELTERSKELTERS, HOTSPOTS, NICKSTICKS, PERISPERMS, POOPERSCOOPERS, POROSPORES (st), POTSHOTS, RICKSTICKS, TYLOSTYLES, and the verb OVERHOVERS.
8 10 12 1vc OUTSHUTS OUERTHUERT ACALYCAL 2vc SENESYNE NIGHINNGHI (stream in Guinea) TEKALITSKALI (stream in Georgia) 3vc ARISARDS NOOGANONGA (pool in Australia) TEESTERS 4vc INGOINGS PERISPERMS SHOESHOP (w2) DERIDERS 5vc MUCKAMUCKS TETEATETES 6vc THREEOTHREES QUADRATOQUADRATS satisfies a 16-letter 8vc pattern
