Ivan Mackenzie Lamb's obituary in The Lichenologist in 1991 refers to him throughout with male pronouns and has a photo of him looking every inch the English Gentleman.
It concludes:
"In several articles published as occasional papers of the Farlow Herbarium (1972, 1973), Lamb acknowledged the technical assistance of Miss Elke Mackenzie, who as lichenologists were to find out, became his alter ego for the remaining 18 years of his life."
https://www.cambridge.org/core/services/aop-cambridge-core/content/view/E0BD8737646993478FB59AE22B264F2F/S0024282991000142a.pdf/ivan_mackenzie_lamb_elke_mackenzie_19111990.pdf
"alter ego" or Autogynephilic Artefact?
Rod Fleming is a "chaser" and misogynist who loathes feminists and has some very old fashioned, homophobic "sexology" theories about what makes a person a man or a woman but he knows a lot about this subject and does not pull his punches:
The Autogynephilic Artefact: How it starts
https://www.rodfleming.com/autogynephilic-artefact-formation/
Lamb's grandson refers to him as his "grandfather" in this article in 2014. So his family do not seem very convinced that he "became a woman".
A Voyage To The Last Continent: Breaking The Ice In Antartica
By Antonio Mackenzie-Lamb
"My journey to Antarctica began in Ushuaia when I boarded the Ocean Diamond, a ship chartered by Quark Expeditions, one of a small handful of tour operators specializing in polar travel. I was making the journey not only to experience Antarctica’s wonders, but to pay my respects to someone I’d never met: my grandfather, Ivan Mackenzie Lamb, who was a scientist stationed on the Antarctic peninsula during World War II. A prominent botanist, he was part of a covert British expedition code-named Operation Tabarin, whose purpose was to establish a British presence during the turbulent wartime period. While stationed at Port Lockroy, my grandfather, whose specialty was the study of lichens, uncovered several fossils of pre-historic tropical plants which once flourished in Antarctica."
https://www.thestkittsnevisobserver.com/voyage-last-continent-breaking-ice-antartica/
The Unsung Heroine of Lichenology
Sabrina Imbler - Sept 26, 2020
(Infuriating article pretending Lamb was a woman, written by a they/them who is either a man pretending to be a woman or a woman pretending to be a man).
"Mackenzie, who died in 1990, transitioned in the final years of her career. Despite this, almost all of Mackenzie’s legacy exists under her former name. I chose not to share it here because I do not know Mackenzie’s relationship to her former name, and she has no way of consenting to its inclusion in this story."
One wonders what the "gender affirming surgery" mentioned in this article consisted of?
He was hospitalised with severe mental health problems and diagnosed with dysphonia prior to "transition". Maybe he had laryngeal surgery after buggering up his voice trying to sound like a woman?
https://daily.jstor.org/the-unsung-heroine-of-lichenology/
Knowing what transwidows tell us about the shenanigans their husbands get up to I am rather suspicious of this account, ie. that it was his wife who ran up debts in his name.
Obituary:
The Bryologist, Vol. 94, No. 3 (Autumn, 1991), pp. 315-320 (6 pages)
"The 1960's were trying years for Lamb. In addition to his extensive travel and field collecting, and the need for planning and implementing the antarctic research and preparation of final reports, scientific papers, and reviews, he had to contend with family and personal crises. Newspaper reports at the time said that debts incurred by Mrs. Lamb in her husband's name forced him to economize by taking quarters in The Farlow, where he subsisted on a diet of potato chips and Coca Cola. He wrote Taylor: "All this with the realization all was not well with me brought me psychologically down to my low state." A concerned colleague brought Lamb to the University Infirmary where he remained for three weeks. At this time he consulted a lawyer and obtained a legal separation. Soon after, he was advised by a psychiatrist to seek the help of a specialist in New York City in resolving a torment that left him uncomfortable with his gender. Lamb was diagnosed as having a Disfonia Syndrome. To correct the problem and achieve a proper identity required transsexual treatment."
https://www.jstor.org/stable/3243974?read-now=1&seq=4
(Anyone can get a free account on JSTOR to read articles online and there is a button on the viewer to copy text).
ps. Sabrina Imbler, the they/them author of the Daily JSTOR article is all over the internet. Caught this but still no wiser if Sabrina is male or female because of the batshittery of gender identity ideology:
"I started thinking about how the personal can be present in nature writing, beyond “I’m a white man on a boat.” "
https://www.vogue.com/article/sabrina-imbler-how-far-the-light-reaches-interview
Very probably female, despite the "white man on a boat" comment, which might be a misleading allusion about the white man's colonisation of the ocean or some such crap.
"A queer, mixed race writer working in a largely white, male field,"
https://www.hachettebookgroup.com/articles/get-to-know-sabrina-imbler/
So if the school is relying on articles like "The Unsung Heroine of Lichenology" by Sabrina there is plenty of scope for criticising the school for covertly introducing Queer Theory into the curriculum, via the "queering" of history by a propagandist who has disrespectfully ignored the testimony of Lamb's family, who still remember him as a father and grandfather. Her area of expertise is sea creatures, not children, education or history.