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Mickle J. E., Barone Lumaga M. R., De Luca P. (2012) – Stomatal development in aerial axes of Psilotum nudum (Psilotaceae) – Journal of the North Carolina Academy of Science, 128(3/4), 2012, pp. 95–99 – DOI: 10.7572/2167-5880-128.3.95 – http://citeweb.info/20121353656 – (On our blog : https://plantstomata.wordpress.com/2017/02/03/stomatal-development-in-psilotum-nudum/)
Paliwal G. S., Kakkar L. (1967) – The stomata of Tmesipteris tannensis Bernh. – Curr. Sci. 36: 412-413 – (Article not found)
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Pant D. D., Mehra B. (1963) – Development of stomata in Psilotum nudum (L.) Beauv. – Curr. Sci. 32: 420-422 (No abstract found – Who can send us one ?)
Zimmerman W. (1927) – Die Spaltöffnungen der Psilophyta und Psilotales – Z. für Bot. 19: 129-170. – (On our blog : https://plantstomata.wordpress.com/2017/02/03/stomata-in-psilophyta-and-psilotales/)
PLANT STOMATA ENCYCLOPEDIA 