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Temperature-dependent London penetration depth, $\lambda(T)$, was measured inoptimally - doped, $x=$0.35, as-grown ($T_c \approx$25 K,RRR=$\rho(300K)/\rho(T_c)$=4.5) and annealed ($T_c \approx$35 K, RRR=6.4)single crystals of SrFe$_2$(As$_{1-x}$P$_{x}$)$_2$ iron - based superconductor.Annealing increases the RRR and decreases the absolute value of the Londonpenetration depth from $\lambda(0) = 300 \pm 10$ nm in as-grown sample to$\lambda(0) = 275 \pm 10$ nm. At low temperatures, $\lambda(T) \sim T$indicating superconducting gap with line nodes. Analysis of the full -temperature range superfluid density is consistent with the line nodes, butdiffers from the simple single - gap $d-$wave. The observed behavior is verysimilar to that of BaFe$_2$(As$_{1-x}$P$_{x}$)$_2$, showing that isovalentlysubstituted pnictides are inherently different from the charge - dopedmaterials.

Nodal superconductivity in isovalently substituted SrFe$_2$(As$_{1-x}$P$_{x}$)$_2$ pnictide superconductor at the optimal doping, $x=$0.35