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Other notable $^{13}$C-cellulose responders include a \textit{Bacteroidetes}  OTU that shares high sequence identity (99\%) to \textit{Sporocytophaga  myxococcoides} a known cellulose degrader \citep{Vance_1980}, and three  \textit{Actinobacteria} OTUs that share high sequence identity (100\%) with  sequenced cultured isolates. One of the three \textit{Actinobacteria}  $^{13}$C-cellulose responders is in the \textit{Streptomyces}, a genus known to  possess cellulose degraders, while the other two share high sequence identity  to cultured isolates \textit{Allokutzneriz albata} \citep{Labeda_2008,  Tomita_1993} and \textit{Lentzea waywayandensis} \citep{LABEDA_1989,  Labeda_2001}; neither isolate decomposes cellulose in culture. Nine  \textit{Plantomycetes} OTUs responded to $^{13}$C-cellulose but none are within  described genera (closest cultured isolate match 91\% sequence identity,  Table~\ref{tab:cell}) (Figure~\ref{fig:trees}). Interestingly, one  $^{13}$C-cellulose responder is annotated as ``cyanobacteria''.  The cyanobacteria phylum annotation is misleading as the OTU is not closely  related to any oxygenic phototrophs (closest cultured isolate match  \textit{Vampirovibrio chlorellavorus}, 95\% sequence identity,  Table~\ref{tab:cell}). A sister clade to the oxygenic phototrophs classically  annotated as ``cyanobacteria'' in SSU rRNA gene reference databases but does  not possess any known phototrophs has recently been proposed to constitute its own  phylum, "Melainabacteria" \citet{Di_Rienzi_2013}. Although the phylogenetic  position of ``Melainabacteria'' is debated \citep{Soo_2014}. The catalog of  metabolic capabilities associated with cyanobacteria (or candidate phyla  previously annotated as cyanobacteria) are quickly expanding  \citep{Di_Rienzi_2013, Soo_2014}. Our findings provide evidence for cellulose  degradation within a lineage closely related to but apart from oxygenic  phototrophs. Notably, polysaccharide degradation is suggested by an analysis of  a ``Melainabacteria'' genome \citep{Di_Rienzi_2013}. Although we highlight  $^{13}$C-cellulose responders that share high sequence identity with described  genera, most $^{13}$C-cellulose responders uncovered in this experiment are not  closely related to cultured isolates (Table~\ref{tab:cell}).