THAI FOR. BULL. (BOT.) 36: 46–51. 2008.
Two new species of ferns from Thailand
STUART LINDSAY*, DAVID J. MIDDLETON* & SOMRAN SUDDEE**
ABSTRACT. Two new species of ferns from southern Thailand are described: Cyclosorus thailandicus S.Linds. (Thelypteridaceae) and Tectaria phanomensis S.Linds. (Tectariaceae).
During a botanical expedition to Southern Thailand in March/April 2003 a number of previously undescribed fern species were collected. One of these has been published already (Lindsay & Middleton, 2004). Two more are described here. Family and genus delimitation follows Smith et al. (2006).
The ferns were compiled for the Flora of Thailand in four parts (Tagawa & Iwatsuki, 1979, 1985, 1988, 1989). Subsequently a number of papers have been published in which new taxa have been described or new records have been added to the pteridophyte diversity of Thailand (Mitsuta, 1985; Parris, 1998; Hovenkamp et al., 1998; Boonkerd & Nooteboom, 2001; Boonkerd & Pollawatn 2002a, 2002b; Lindsay & Middleton, 2004; Lindsay et al., 2004; Suksathan, 2004; Boonkerd, 2006). Boonkerd & Pollawatn (2000) compiled a list with distribution maps and many photographs of all the pteridophytes of Thailand in which an additional 27 species were included. Boonkerd et al. (2005) added another 19 species. This rate of addition of new taxa and new records to a recently completed Flora account reflects the fact that pteridophytes are often neglected on traditional collecting expeditions and is testament to the relatively poor state of our taxonomic knowledge of them compared to many angiosperm plant groups.
Two of the most difficult groups in Thailand are Tectaria and its relatives and Thelypteris and its relatives. For Tectaria there is the Flora of Thailand account (Tagawa & Iwatsuki 1988 – under Dryopteridaceae) and Holttum (1991 – under Tectaria group) to account for all of the southern Thai and Malesian species. For Thelypteridaceae there are a number of publications by Holttum (1976, 1982) in addition to the Flora of Thailand account (Tagawa & Iwatsuki 1988). It is quite clear that these two new species are not accounted for in these works.
Royal Botanic Garden Edinburgh, 20A Inverleith Row, Edinburgh, EH3 5LR, Scotland.
** The Forest Herbarium, National Park, Wildlife and Plant Conservation Department, Chatuchak, Bangkok 10900, Thailand.