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Two new species of  Ramicrusta  (Peyssonneliaceae, Rhodophyta),  Ramicrusta bonairensis  from Bonaire, The Netherlands Antilles and Puerto Rico and  Ramicrusta monensis  from Puerto Rico are described on the basis of both morphological and genetic criteria. Both grow closely appressed to their substrata, a characteristic that differs from their Caribbean congener,  Ramicrusta textilis , which forms flared or broadly fluted, expanded erect tissue, and is not closely appressed throughout. The new species also share with each other, the character, seen in microscopic sections, of appearing layered due to an abrupt decrease in cell size that occurs in the perithallus.  Ramicrusta bonairensis  is thicker than  R. monensis , forming crusts up to 840 μm thick and carposporangia that measure up to 80 μm in length.  Ramicrusta monensis  is less thick, 585–650 μm, and produces smaller carposporangia, 40–50 μm in length. Overgrowing thalli in  R. monensis  are commonly observed, frequently resulting in gaps visible in transverse microscopic sections. Irregular perithallial growth may also result in hollow regions. Male gametophytes are reported for the first time in  R. textilis  and in  R. monensis . Mixed reproductive phases in individual thalli, with both male gametophytic structures and tetrasporangial nemathecia, are also observed in  R. monensis .

botanica marina

The genus  Ramicrusta  (Peyssonneliales, Rhodophyta) in the Caribbean Sea, including  Ramicrusta bonairensis  sp. nov.  and Ramicrusta monensis  sp. nov.