OpenTwo archives, queried live.
Every record below comes from The Met or Smithsonian Open Access and was filtered on that archive’s own rights field before it reached this page. 12 shown for “Cylindrospermum phaeospermum Rabenh.” — 40 records examined, 12 dropped by the rights gate.
Archives queried 2026-09-10 20:20 UTC · fetched live for this request
isPublicDomain field is true for this object.metadata_usage.access reads CC0 — a waiver, not an expired term.
Cylindrospermum phaeospermum Rabenh.
Artist not stated in the record · -- --- 18--
Cylindrospermum kirchnerianum Cohn in Rabenh.
Artist not stated in the record · 20 Nov 1872
Botryocystis volvox Kütz. in Rabenh.
Artist not stated in the record · Jul 1853
Cylindrospermum stagnale var. australe Playfair
Artist not stated in the record
Cylindrospermum echigoense Noda
Artist not stated in the record · 30 Aug 1970
Cylindrospermum breve Welsh
Artist not stated in the record · 5 Aug 1961
Cylindrospermum muscicola Kütz.
Artist not stated in the record
Cylindrospermum rectangulare Playfair
Artist not stated in the record
Cylindrospermum stagnale var. minus J. E. Tilden
Artist not stated in the record · 10 Jul 1900
Cylindrospermum majus var. carringtonii J. Samp.
Artist not stated in the record · 5 Dec 1957
Cylindrospermum minutissimum Collins
Artist not stated in the record · 12 Oct 1890
Cylindrospermum caeruleum Dickie
Artist not stated in the record · 3 Oct 1874
Where these records came from.
Two archives are wired, and only two. Each one is filtered on its own rights field — never on a title match, and never on the presence of an image file.
- The Met Collection API (Open Access)Rights field:
isPublicDomain. The archive returned no records for this term.0 matched - Smithsonian Open Access API (api.si.edu)Rights field:
content.descriptiveNonRepeating.metadata_usage.access. 1508 matched · 40 examined · 12 dropped by the rights gate. Kept only where metadata_usage.access === "CC0" and an image resource was published.12 shown
These figures describe the pass run at 2026-09-10 20:20 UTC, during this request. A completed pass is kept for 24 hours and replayed for an identical search, which is what keeps repeated queries inside Smithsonian’s 30-requests-per-hour allowance. A pass in which either archive failed to answer is never kept — an outage must not be replayed as though it were a finding about the catalogue.
Wikimedia Commons and the Library of Congress are deliberately not wired. Wikimedia was confirmed, on a live query, to return CC-BY material inside the same result set as genuine public domain works, and filtering it safely has not been designed yet. loc.gov was blocked by bot detection during the source evaluation, so its rights vocabulary has never been observed — and nothing here is built on a field nobody has read.
An image file is a rights claim. It never travels without its field.