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/usr/lib/R/site-library/phylobase/nexusfiles/co1.nex is in r-cran-phylobase 0.8.2-1.

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#NEXUS

[ID: 0916634271]
begin trees;
   [Note: This tree contains information on the topology, 
          branch lengths (if present), and the probability
          of the partition indicated by the branch.]
   tree con_50_majrule = (Cow:0.143336,Seal:0.225087,((((((Carp:0.171296,Loach:0.222039)1.00:0.194575,Frog:0.237101)0.76:0.073060,Chicken:0.546258)1.00:0.204809,Human:0.533183)0.99:0.124549,(Mouse:0.134574,Rat:0.113163)1.00:0.154442)0.88:0.055934,Whale:0.145592)0.93:0.047441);

   [Note: This tree contains information only on the topology
          and branch lengths (mean of the posterior probability density).]
   tree con_50_majrule = (Cow:0.143336,Seal:0.225087,((((((Carp:0.171296,Loach:0.222039):0.194575,Frog:0.237101):0.073060,Chicken:0.546258):0.204809,Human:0.533183):0.124549,(Mouse:0.134574,Rat:0.113163):0.154442):0.055934,Whale:0.145592):0.047441);
end;