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H.E. Connor identified two additional species of Rytidosperma among specimens that have been found as escapes in Alameda and San Mateo counties, California. They are Rytidosperma caespitosa (Gaudich.) Connor & Edgar, and R. richardsonii (Cashmore) Connor & Edgar. Both are native to Australia. Rytidosperma caespitosa differs from the three species included in volume 25 in having two rows of tufts of hair in which the upper row of hairs greatly exceeds the lemma body. Like R. biannulare, it has intravaginal branching. Rytidosperma richardsonii has lemma lobes that are shorter than the lemma body, and obovate paleas that are 2-2.5 mm wide.
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