Mats or cushions to sit on.

A Dictionary of Chinese Buddhist Terms, William Edward Soothill and Lewis Hodous

 tṛṇa-saṃstara, tṛṇa-saṃstarōpaviṣṭa, tṛṇāsana*.

佛教漢梵大辭典, 平川彰 Buddhist Chinese-Sanskrit Dictionary, Akira Hirakawa

P.3139-P.3150

 

草座 (cǎo zuò) 　( “a mat of grass” )

{《漢語大詞典》9.371a(唐代)} ; {《大漢和辞典》9.646a(唐代)} ;

Dharmarakṣa: {127a9} 假使有人求菩薩乘，至此道場，吾授斯華，以爲草座，敷佛樹下……(p)

{K.421.7} tṛṇa-saṃstara~

Kumārajīva: {not found at L.54c29} 

A Digital Edition of A Glossary of Dharmarakṣa translation of the Lotus Sutra by Seishi Karashima, 1998