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bayhaqi:8965Abū Bakr > Abū al-ʿAbbās > al-Rabīʿ > al-Shāfiʿī > Saʿīd b. Sālim al-Qaddāḥ > al-Ḥasan b. Zayd from his father

[Machine] I saw Ibn Abbas in ihram, and indeed, on his head was something like the size of a camel's hump from the pebbles of Al-Ghaliyah.  

البيهقي:٨٩٦٥وَأَخْبَرَنَا أَبُو بَكْرٍ ثنا أَبُو الْعَبَّاسِ أنبأ الرَّبِيعُ أنبأ الشَّافِعِيُّ أنبأ سَعِيدُ بْنُ سَالِمٍ الْقَدَّاحُ عَنِ الْحَسَنِ بْنِ زَيْدٍ عَنْ أَبِيهِ قَالَ

رَأَيْتُ ابْنَ عَبَّاسٍ مُحْرِمًا وَإنَّ عَلَى رَأْسِهِ لَمِثْلَ الرُّبِّ مِنَ الْغَالِيَةِ