Table 1. Methylated sugars analysed in detail so far.

Sugar	Linkage	Bacteria	Algae and Plant	Other organism
Mannose	2-O-Me			Diverse mould species: De Ruiter et al., 1994;
	3-O-Me			Mucor rouxii: Lederkremer and Parodi, 1984; Platyhelminth: Paschinger et al., 2011; Natsuka et al., 2011; Gastropod: Hall et al., 1977; v. Kuik et al., 1986; Marxen et al., 2003; Gutternigg et al., 2004; Idakieva et al., 2004; Gutternigg et al., 2007; Lehr et al., 2007; Stepan et al., 2010;
	4-O-Me	Bradyrhizobium japonicum: Carlson and Krishnaiah, 1992; Erwinia carotovora: Senchenkova et al., 2003;
	6-O-Me		Red microalga: Levy-Ontman et al., 2011;	Mollusc: Puanglarp et al., 1995;
	Di/poly-methylated			Mollusc: Puanglarp et al., 1995;
Galactose	2-O-Me		Seaweed: Duarte et al., 2002; Kolender and Matulewicz, 2002; Watt et al., 2002; Zibetti et al., 2009;
	3-O-Me		Seaweed: Watt et al., 2002; Navarro and Stortz, 2008; Plant (lycophyte): Popper et al., 2001; Higher plants: Hokputsa et al., 2004; Capek and Hříbalová, 2004; Capek, 2008;	Fungi: Rosado et al., 2002: Yang et al., 2007; Gastropod: Hall et al., 1977; Stoeva et al., 1984; Araki et al., 1986; v. Kuik et al., 1987; Lommerse et al., 1997; Dolashka-Angelova et al., 2003; Idakieva et al., 2004; Gutternigg et al., 2007; Stepan et al., 2010;
	4-O-Me		Seaweed: Zibetti et al., 2009;	Nematode: Khoo et al., 1991; Gastropod: Lommerse et al., 1997; Stepan et al., 2010;
	6-O-Me		Seaweed: Duarte et al., 2002; Kolender and Matulewicz, 2002; Zibetti et al., 2009;
	Di/poly- methylated	Sinorhizobium fredii: Rodriguez-Carvajal et al., 2005;	Seaweed: Navarro and Stortz, 2008;
Glucose	6-O-Me		Plant: Patra et al., 2010;
Xylose	2-O-Me		Plant: Ghosh et al., 2008;
	3-O-Me	Sediments (cyanobacteria?): Sinninghe Damsté et al., 2001;	Red algae: Capak et al., 2008;
	4-O-Me		Red algae: Capak et al., 2008;
Fucose	2-O-Me	Rhizobium etli: Forsberg et al. 2000; Noel et al., 2004; Bradyrhizobia: Sanjuan et al., 1992; Renier et al., 2011; Bacillus anthracis and related organisms: Fox et al., 2003;	Plants: Glushka et al., 2003;	Annelid: Talmont and Fournet,1991; Nematode: Khoo et al 1991; Guéradel et al 2001; Haslam et al. 2002; Paschinger et al. 2008;
	3-O-Me	Mesorhizobium huakuii: Turska-Szweczuk and Russa, 2011;		Annelid: Talmont and Fournet, 1991;
	Di/poly-methyated	Rhizobium etl: Forsberg et al., 2000;	Red algae: Capak et al., 2008;	Annelid: Talmont and Fournet, 1991;
Rhamnose	2-O-Me	Bacillus anthracis and related organisms: Fox et al., 2003; Streptomyces: Keller-Schierlein et al., 1970; McAlpine et al., 1971; Mycobacterium tuberculosis: Demareau-Ginsburg and Lederer, 1963;
	3-O-Me	Bacillus anthracis and related organisms: Fox et al., 2003; Mycobacteria: Khoo et al., 1996; Schorey and Sweet, 2008; Mesorhizobium: Zdorovenko et al., 2009; Pseudomonas: Zdorovenko et al., 2001; Cryptosporangium mongoliense: Ara et al., 2011; Sediments (cyanobacteria?): Sinninghe Damsté et al., 2001;		Fungi (Hericium erinaceus): Zhang et al., 2006;
	4-O-Me	Mycobacterium intracellulare: Naka et al., 2011;
	Di/poly-methylated	Mycobacteria: Khoo et al., 1996;	Red algae: Capak et al., 2008;
GlcNAc	3-O-Me			Gastropod: Dolashka-Angelova et al., 2003;
	4-O-Me	Mesorhizobia: Zdorovenko et al., 2009;
Glucuronic acid	4-O-Me	Mycobacterium habana: Khoo et al., 1996;	Plant: Dinand and Vignon, 2001; Habibi et al., 2002; Sun et al., 2011;	Mollusc: Hori et al., 1983;
	Di/Poly- methylated	Mycobacterium habana: Khoo et al., 1996;
Galacturonic acid	6-O-Me		Plant: Sarkar et al., 2011; Patra et al., 2010; Patra et al., 2012; Ojha et al., 2009; Ghosh et al., 2008; Ghosh et al., 2009; Das et al., 2009a; Das et al., 2009b; Chandra et al., 2009 Patra et al., 2010;
(deoxy) Talose	3-O-Me	Mycobacterium: Khoo et al., 1996; Schorey and Sweet, 2008; Rhizobium etli: Forsberg et al., 2000;