Frederick W. Turner appeals from the district court’s denial of his pro se petition for writ of habeas corpus. See 28 U.S.C. § 2254 (1988). On appeal, Turner argues only that the state trial court erred in failing to properly instruct the jury on voluntary manslaughter, a lesser included offense of second-degree murder, of which Turner was convicted. Because we conclude that the sole claim presented by Turner does not present a constitutional question, we affirm.
Following a three-day jury trial in Lincoln County, Missouri, Turner was convicted of second-degree murder and sentenced to prison for thirty years. The conviction was affirmed by the Missouri Court of Appeals, and Turner properly exhausted all state remedies. On May 15, 1989, he filed a petition for writ of habeas corpus in the Eastern District of Missouri, arguing error on several grounds. Of relevance to this appeal, Turner argued that he was denied his constitutional right to due process because the trial court improperly instructed the jury on voluntary manslaughter, a lesser included offense of second-degree murder. 1 Turner argues that the trial court gave identical instructions on second-degree murder and voluntary manslaughter, thereby failing to instruct the jury that voluntary manslaughter differs from second-degree murder because the actor causing death acts “under the influence of sudden passion arising from adequate cause.” Mo.Rev.Stat. § 565.023 (1979 & Supp.1990). After considering all of Turner’s claims, the district court denied the petition on January 29, 1990. Turner filed a notice of appeal on April 6, 1990.
The state argues that we lack jurisdiction over this appeal because Turner did not file his notice of appeal within thirty days after the district court denied the petition.
See
Fed.R.App.P. 4(a). Subject matter jurisdiction, of course, is a threshold requirement which must be assured in every federal case.
Kronholm v. FDIC,
Nevertheless, Rule 3(c), which details the required contents of a notice of appeal, provides, in an amendment adopted in 1979, that “[a]n appeal shall not be dismissed for informality of form or title of. the notice of appeal.” Fed.R.App.P. 3(c). The advisory committee notes indicate that the amendment was intended to provide for liberal construction of Rule 3(c). “[S]o long as the function of notice is met by the filing of a paper indicating an intention to appeal, the substance of the rule has been complied with.” Advisory Committee Notes to Rule 3.
See also Torres,
At least five circuits have held that a motion for certificate of probable cause, filed by a pro se petitioner within the time limits of Rule 4(a), can serve as the functional equivalent of a notice of appeal.
See, e.g., Tinsley v. Borg,
Turner filed his pro se application for a certificate of probable cause on February 8, 1990, within thirty days of January 29, 1990, when the district court denied his habeas petition. Turner’s application satisfied the requirements of Rule 3(c): it names the party taking the appeal, designates the judgment appealed from, and names the court to which the appeal is taken. It is clearly sufficient to give notice that Turner intended to appeal from the district court’s denial of his petition for writ of habeas corpus. Thus, while the proper procedure requires that a petitioner first file a notice of appeal and then seek a certificate of probable cause, without which the appeal cannot proceed,
see Latella v. Jackson,
Turner’s sole argument on appeal, however, is without merit. We held in
Pitts v. Lockhart,
*495 The judgment of the district court is affirmed.
Notes
. The state argues that Turner did not present this claim to the district court, and that it is procedurally barred. We liberally construe pro se habeas petitions, however, and we have no difficulty concluding from Turner’s petition that he intended to challenge the trial court’s instruction on manslaughter. Therefore, we consider Turner’s argument on the merits.
