Ralf 's books and ferm photos

Book:

https://www.books.com.tw/products/0010507119


American Fern Journal 103(3):191–192 (2013)

https://www.researchgate.net/publication/260831704_Ferns_and_Fern_Allies_of_Taiwan_-_a_review


photos

https://get.google.com/albumarchive/116136418529949606360

introduction

https://taiwantoday.tw/news.php?post=14110&unit=8,8,29,29,32,32,45