diff -r 6d87fbbfc10a -r a0816159a647 roundup/cgi/engine_jinja2.py
--- a/roundup/cgi/engine_jinja2.py	Thu Jun 18 15:36:58 2015 +0300
+++ b/roundup/cgi/engine_jinja2.py	Mon Jun 22 17:21:40 2015 +0300
@@ -53,7 +53,7 @@
         self._env.filters.update(additional_filters)
 
     def check(self, tplname):
-        #print tplname
+        tplname = self.reformTplName(tplname)
         try:
             #print self._env.get_template(tplname + '.html')
             self._env.get_template(tplname + '.html')
@@ -64,6 +64,7 @@
 
     def load(self, tplname):
         #src, filename = self.check(tplname)
+        tplname = self.reformTplName(tplname)
         return Jinja2ProxyPageTemplate(self._env.get_template(tplname + '.html'))
 
     def precompile(self):
diff -r 6d87fbbfc10a -r a0816159a647 roundup/cgi/templating.py
--- a/roundup/cgi/templating.py	Thu Jun 18 15:36:58 2015 +0300
+++ b/roundup/cgi/templating.py	Mon Jun 22 17:21:40 2015 +0300
@@ -106,6 +106,39 @@
         """
         raise NotImplementedError
 
+    def reformTplName(self, tplname):
+        """ Exract subdir part from tplname.
+            Use this to allow subdirectories in template name,
+            such as "@template=mobile/index".
+            Canonized tplname prefixed by subdirs is returned
+
+            tplname formed as classname.templatename,
+            so url "/issue?@template=mobile/index" transformed
+            by selectTemplate function to tplname value:
+            issue.mobile/index
+            This function with such argument will return:
+            mobile/issue.index
+        """
+        # may be, do nothing?
+        if '/' not in tplname:
+            return tplname
+
+        (classname, viewpart) = tplname.split('.', 1)
+
+        vparts = viewpart.split('/')
+        if len(vparts) < 2:
+            # this is not the case we work on
+            return tplname
+        # allow '/' in prefix
+        if not vparts[0]:
+            del vparts[0]
+
+        # put the last element (view name) back in canonical form
+        vparts[-1] = classname + '.' + vparts[-1]
+
+        return os.path.join( *vparts )
+
+
 class TALLoaderBase(LoaderBase):
     """ Common methods for the legacy TAL loaders."""